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boot.c

Last change on this file was 688, checked in by alain, 4 years ago
cosmetic
File size: 38.2 KB

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1	/*
2	* boot.c - TSAR bootloader implementation.
3	*
4	* Authors : Vu Son (2016)
5	* Alain Greiner (2016,2017,2018,2019,2020)
6	*
7	* Copyright (c) UPMC Sorbonne Universites
8	*
9	* This file is part of ALMOS-MKH.
10	*
11	* ALMOS-MKH is free software; you can redistribute it and/or modify it
12	* under the terms of the GNU General Public License as published by
13	* the Free Software Foundation; version 2.0 of the License.
14	*
15	* ALMOS-MKH is distributed in the hope that it will be useful, but
16	* WITHOUT ANY WARRANTY; without even the implied warranty of
17	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18	* General Public License for more details.
19	*
20	* You should have received a copy of the GNU General Public License
21	* along with ALMOS-MKH; if not, write to the Free Software Foundation,
22	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
23	*/
24
25	/****************************************************************************
26	* This file contains the ALMOS-MKH. boot-loader for the TSAR architecture. *
27	* that is a clusterised, shared memory, multi-processor architecture, *
28	* where each processor core is identified by a composite index [cxy,lid] *
29	* with one physical memory bank per cluster. *
30	* *
31	* The 'boot.elf' file (containing the boot-loader binary code) is stored *
32	* on disk (not in the FAT file system), and must be loaded into memory *
33	* by the generic (OS undependant) preloader. *
34	* *
35	* The main task of the boot-loader is to load in the first physical page *
36	* of each cluster a copy of the kernel code (segments "kcode" and "kdata") *
37	* and to build - in each cluster - a cluster specific description of the *
38	* hardware archtecture, stored in the "kdata" segment as the boot_info_t *
39	* structure. These "kernel.elf" and "arch_info.bin" files are supposed *
40	* to be stored on disk in a FAT32 file system. *
41	* *
42	* All cores contribute to the boot procedure, but all cores are not *
43	* simultaneously active: *
44	* - in a first phase, only core[0][0] is running (core 0 in cluster 0). *
45	* - in a second phase, only core[cxy][0] is running in each cluster. *
46	* - in last phase, all core[cxy][lid] are running. *
47	* *
48	* Finally, all cores jump to the kernel_init() function that makes the *
49	* actual kernel initialisation. *
50	* *
51	* Implementation note: *
52	* *
53	* To allows each core to use the local copy of both the boot code and the *
54	* kernel code, the boot-loader builds a minimal and temporary BPT (Boot *
55	* Page Table) containing only two big pages: page[0] maps the kernel code, *
56	* and page 1 maps the boot code. *
57	****************************************************************************/
58
59	#include <elf-types.h>
60	#include <hal_kernel_types.h>
61
62	#include <kernel_config.h>
63	#include <boot_config.h>
64
65	#include <arch_info.h>
66	#include <boot_info.h>
67
68	#include <boot_utils.h>
69	#include <boot_fat32.h>
70	#include <boot_bdv_driver.h>
71	#include <boot_hba_driver.h>
72	#include <boot_tty_driver.h>
73
74	/*****************************************************************************
75	* Macros.
76	****************************************************************************/
77
78	#define PAGE_ROUND_DOWN(x) ((x) & (~PPM_PAGE_SIZE -1))
79	#define PAGE_ROUND_UP(x) (((x) + PPM_PAGE_SIZE-1) & \
80	(~(PPM_PAGE_SIZE-1)))
81
82	/*****************************************************************************
83	* Global variables.
84	****************************************************************************/
85
86	// the Boot Page Table contains two PTE1, and should be aligned on 8 Kbytes
87
88	uint32_t boot_pt[2] __attribute__((aligned(0x2000)));
89
90	// synchronization variables.
91
92	volatile boot_remote_spinlock_t tty0_lock; // protect TTY0 access
93	volatile boot_remote_barrier_t global_barrier; // synchronize CP0 cores
94	volatile boot_remote_barrier_t local_barrier; // synchronize cores in one cluster
95	uint32_t active_cores_nr; // number of expected CP0s
96
97	// kernel segments layout variables
98
99	uint32_t seg_kcode_base; // kcode segment base address
100	uint32_t seg_kcode_size; // kcode segment size (bytes)
101	uint32_t seg_kdata_base; // kdata segment base address
102	uint32_t seg_kdata_size; // kdata segment size (bytes)
103
104	uint32_t kernel_entry; // kernel_init() function
105
106	// Functions
107
108	extern void boot_entry( void ); // boot_loader entry point
109	extern void boot_loader( lid_t lid, cxy_t cxy );
110
111
112	#if DEBUG_BOOT_INFO
113	/*********************************************************************************
114	* This debug function returns the printable string for each device type.
115	********************************************************************************/
116	static char * device_type_str( enum device_types_e dev_type )
117	{
118	switch ( dev_type )
119	{
120	case DEV_TYPE_RAM_SCL: return "RAM_SCL";
121	case DEV_TYPE_ROM_SCL: return "ROM_SCL";
122	case DEV_TYPE_FBF_SCL: return "FBF_SCL";
123	case DEV_TYPE_IOB_TSR: return "IOB_TSR";
124	case DEV_TYPE_IOC_BDV: return "IOC_BDV";
125	case DEV_TYPE_IOC_HBA: return "IOC_HBA";
126	case DEV_TYPE_IOC_SDC: return "IOC_SDC";
127	case DEV_TYPE_IOC_SPI: return "IOC_SPI";
128	case DEV_TYPE_IOC_RDK: return "IOC_RDK";
129	case DEV_TYPE_MMC_TSR: return "MMC_TSR";
130	case DEV_TYPE_DMA_SCL: return "DMA_SCL";
131	case DEV_TYPE_NIC_CBF: return "NIC_CBF";
132	case DEV_TYPE_TIM_SCL: return "TIM_SCL";
133	case DEV_TYPE_TXT_TTY: return "TXT_TTY";
134	case DEV_TYPE_TXT_MTY: return "TXT_MTY";
135	case DEV_TYPE_ICU_XCU: return "ICU_XCU";
136	case DEV_TYPE_PIC_TSR: return "PIC_TSR";
137	default: return "undefined";
138	}
139	}
140	#endif
141
142	/************************************************************************************
143	* This function loads the arch_info.bin file into the boot cluster memory.
144	***********************************************************************************/
145	static void boot_archinfo_load( void )
146	{
147	archinfo_header_t * header = (archinfo_header_t*)ARCHINFO_BASE;
148
149	// Load file into memory
150	if (boot_fat32_load(ARCHINFO_PATHNAME, ARCHINFO_BASE, ARCHINFO_MAX_SIZE))
151	{
152	boot_printf("\n[BOOT ERROR]in %s : <%s> file not found\n",
153	__FUNCTION__, ARCHINFO_PATHNAME);
154	boot_exit();
155	}
156
157	if (header->signature != ARCHINFO_SIGNATURE)
158	{
159	boot_printf("\n[BOOT_ERROR]: boot_archinfo_load(): "
160	"<%s> file signature should be %x\n",
161	ARCHINFO_PATHNAME, ARCHINFO_SIGNATURE);
162	boot_exit();
163	}
164
165	#if DEBUG_BOOT_INFO
166	boot_printf("\n[BOOT INFO] in %s : file %s loaded at address = %x\n",
167	__FUNCTION__ , ARCHINFO_PATHNAME , ARCHINFO_BASE );
168	#endif
169
170	} // boot_archinfo_load()
171
172	/**************************************************************************************
173	* This function loads the 'kernel.elf' file into the boot cluster memory buffer,
174	* analyzes it, and places the kcode and kdata segments at their final physical
175	* adresses (defined the .elf file), and set the kernel layout global variables.
176	*************************************************************************************/
177	static void boot_kernel_load( void )
178	{
179	Elf32_Ehdr * elf_header; // pointer on kernel.elf header.
180	Elf32_Phdr * program_header; // pointer on kernel.elf program header.
181	uint32_t phdr_offset; // program header offset in kernel.elf file.
182	uint32_t segments_nb; // number of segments in kernel.elf file.
183	uint32_t seg_src_addr; // segment address in kernel.elf file (source).
184	uint32_t seg_paddr; // segment local physical address of segment
185	uint32_t seg_offset; // segment offset in kernel.elf file
186	uint32_t seg_filesz; // segment size (bytes) in kernel.elf file
187	uint32_t seg_memsz; // segment size (bytes) in memory image.
188	bool_t kcode_found; // kcode segment found.
189	bool_t kdata_found; // kdata segment found.
190	uint32_t seg_id; // iterator for segments loop.
191
192	#if DEBUG_BOOT_ELF
193	boot_printf("\n[BOOT INFO] %s enters for file %s at cycle %d\n",
194	__FUNCTION__ , KERNEL_PATHNAME , boot_get_proctime() );
195	#endif
196
197	// Load kernel.elf file into memory buffer
198	if ( boot_fat32_load(KERNEL_PATHNAME, KERN_BASE, KERN_MAX_SIZE) )
199	{
200	boot_printf("\n[BOOT ERROR] in %s : <%s> file not found\n",
201	KERNEL_PATHNAME);
202	boot_exit();
203	}
204
205	// get pointer to kernel.elf header
206	elf_header = (Elf32_Ehdr*)KERN_BASE;
207
208	// check signature
209	if ((elf_header->e_ident[EI_MAG0] != ELFMAG0) \|\|
210	(elf_header->e_ident[EI_MAG1] != ELFMAG1) \|\|
211	(elf_header->e_ident[EI_MAG2] != ELFMAG2) \|\|
212	(elf_header->e_ident[EI_MAG3] != ELFMAG3))
213	{
214	boot_printf("\n[BOOT_ERROR]: boot_kernel_load(): "
215	"<%s> is not an ELF file\n",
216	KERNEL_PATHNAME);
217	boot_exit();
218	}
219
220	// Get program header table offset and number of segments
221	phdr_offset = elf_header->e_phoff;
222	segments_nb = elf_header->e_phnum;
223
224	// Get program header table pointer
225	program_header = (Elf32_Phdr*)(KERN_BASE + phdr_offset);
226
227	// loop on segments
228	kcode_found = false;
229	kdata_found = false;
230	for (seg_id = 0; seg_id < segments_nb; seg_id++)
231	{
232	if (program_header[seg_id].p_type == PT_LOAD) // Found one loadable segment
233	{
234	// Get segment attributes.
235	seg_paddr = program_header[seg_id].p_paddr;
236	seg_offset = program_header[seg_id].p_offset;
237	seg_filesz = program_header[seg_id].p_filesz;
238	seg_memsz = program_header[seg_id].p_memsz;
239
240	// get segment base address in buffer
241	seg_src_addr = (uint32_t)KERN_BASE + seg_offset;
242
243	// Load segment to its final physical memory address
244	boot_memcpy( (void*)seg_paddr,
245	(void*)seg_src_addr,
246	seg_filesz );
247
248	#if DEBUG_BOOT_ELF
249	boot_printf("\n[BOOT INFO] in %s for file %s : found loadable segment\n"
250	" base = %x / size = %x\n",
251	__FUNCTION__ , KERNEL_PATHNAME , seg_paddr , seg_memsz );
252	#endif
253
254	// Fill remaining memory with zero if (filesz < memsz).
255	if( seg_memsz < seg_filesz )
256	{
257	boot_memset( (void*)(seg_paddr + seg_filesz), 0, seg_memsz - seg_filesz);
258	}
259
260	// Note: we suppose that the 'kernel.elf' file contains exactly
261	// two loadable segments : kcode & kdata
262
263	if( program_header[seg_id].p_paddr == KCODE_BASE ) // kcode segment
264	{
265	if( kcode_found )
266	{
267	boot_printf("\n[BOOT_ERROR] in %s for file %s :\n"
268	" two kcode segments found\n",
269	__FUNCTION__ , KERNEL_PATHNAME );
270	boot_exit();
271	}
272
273	kcode_found = true;
274	seg_kcode_base = seg_paddr;
275	seg_kcode_size = seg_memsz;
276	}
277	else // kdata segment
278	{
279	if( kdata_found )
280	{
281	boot_printf("\n[BOOT_ERROR] in %s for file %s :\n"
282	" two kdata segments found\n",
283	__FUNCTION__ , KERNEL_PATHNAME );
284	boot_exit();
285	}
286
287	kdata_found = true;
288	seg_kdata_base = seg_paddr;
289	seg_kdata_size = seg_memsz;
290	}
291	}
292	}
293
294	// check kcode & kdata segments found
295	if( kcode_found == false )
296	{
297	boot_printf("\n[BOOT_ERROR] in %s for file %s : seg_kcode not found\n",
298	__FUNCTION__ , KERNEL_PATHNAME );
299	boot_exit();
300	}
301	if( kdata_found == false )
302	{
303	boot_printf("\n[BOOT_ERROR] in %s for file %s : seg_kdata not found\n",
304	__FUNCTION__ , KERNEL_PATHNAME );
305	boot_exit();
306	}
307
308	// check segments sizes
309	if( (seg_kcode_size + seg_kdata_size) > KCODE_MAX_SIZE )
310	{
311	boot_printf("\n[BOOT_ERROR] in %s for file %s : seg_kcode + seg_kdata too large\n",
312	__FUNCTION__ , KERNEL_PATHNAME );
313	}
314
315	// set entry point
316	kernel_entry = (uint32_t)elf_header->e_entry;
317
318	#if DEBUG_BOOT_ELF
319	boot_printf("\n[BOOT INFO] %s completed for file %s at cycle %d\n",
320	__FUNCTION__ , KERNEL_PATHNAME , boot_get_proctime() );
321	#endif
322
323	} // boot_kernel_load()
324
325	/*************************************************************************************
326	* This function initializes the boot_info_t structure for a given cluster.
327	* @ boot_info : pointer to local boot_info_t structure
328	* @ cxy : cluster identifier
329	************************************************************************************/
330	static void boot_info_init( boot_info_t * boot_info,
331	cxy_t cxy )
332	{
333	archinfo_header_t * header;
334	archinfo_core_t * core_base;
335	archinfo_cluster_t * cluster_base;
336	archinfo_device_t * device_base;
337	archinfo_irq_t * irq_base;
338
339	archinfo_cluster_t * cluster;
340	archinfo_cluster_t * my_cluster = NULL; // target cluster
341	archinfo_cluster_t * io_cluster = NULL; // external peripherals cluster
342
343	archinfo_core_t * core;
344	uint32_t core_id;
345	archinfo_device_t * device;
346	uint32_t device_id;
347	archinfo_irq_t * irq;
348	uint32_t irq_id;
349	uint32_t end;
350	boot_device_t * boot_dev;
351
352	#if DEBUG_BOOT_INFO
353	boot_printf("\n[BOOT INFO] %s : enter at cycle %d\n",
354	__FUNCTION__ , boot_get_proctime() );
355	#endif
356
357	// get pointer on ARCHINFO header and on the four arch_info arrays
358	header = (archinfo_header_t*)ARCHINFO_BASE;
359	core_base = archinfo_get_core_base (header);
360	cluster_base = archinfo_get_cluster_base(header);
361	device_base = archinfo_get_device_base (header);
362	irq_base = archinfo_get_irq_base (header);
363
364	// Initialize global platform parameters
365	boot_info->x_size = header->x_size;
366	boot_info->y_size = header->y_size;
367	boot_info->x_width = header->x_width;
368	boot_info->y_width = header->y_width;
369	boot_info->paddr_width = header->paddr_width;
370	boot_info->io_cxy = header->io_cxy;
371	boot_info->sys_clk = header->sys_clk;
372
373	// Initialize kernel segments from global variables
374	boot_info->kcode_base = seg_kcode_base;
375	boot_info->kcode_size = seg_kcode_size;
376	boot_info->kdata_base = seg_kdata_base;
377	boot_info->kdata_size = seg_kdata_size;
378
379	// loop on arch_info clusters to build cluster_info[][] array
380	// and get io_cluster and my_cluster pointers
381	for (cluster = cluster_base;
382	cluster < &cluster_base[header->x_size * header->y_size];
383	cluster++)
384	{
385	int x = cluster->cxy >> Y_WIDTH;
386	int y = cluster->cxy & ((1 << Y_WIDTH) - 1);
387	boot_info->cluster_info[x][y] = (uint8_t)cluster->cores;
388
389	if( cluster->cxy == cxy ) my_cluster = cluster;
390	if( cluster->cxy == header->io_cxy ) io_cluster = cluster;
391	}
392
393	if( my_cluster == NULL )
394	{
395	boot_printf("\n[ERROR] in %s : cannot found cluster %x in arch_info\n",
396	__FUNCTION__ , cxy );
397	boot_exit();
398	}
399
400	if( io_cluster == NULL )
401	{
402	boot_printf("\n[ERROR] in %s : cannot found io_cluster %x in arch_info\n",
403	__FUNCTION__ , cxy );
404	boot_exit();
405	}
406
407	//////////////////////////////////////////////////////////
408	// initialize the boot_info array of external peripherals
409
410	#if DEBUG_BOOT_INFO
411	boot_printf("\n[BOOT INFO] %s : external peripherals at cycle %d\n",
412	__FUNCTION__ , boot_get_proctime() );
413	#endif
414
415	device_id = 0;
416	for (device = &device_base[io_cluster->device_offset];
417	device < &device_base[io_cluster->device_offset + io_cluster->devices];
418	device++ )
419	{
420	if( device_id >= CONFIG_MAX_EXT_DEV )
421	{
422	boot_printf("\n[ERROR] in %s : too much external devices in arch_info\n",
423	__FUNCTION__ );
424	boot_exit();
425	}
426
427	// keep only external devices
428	if( (device->type != DEV_TYPE_RAM_SCL) &&
429	(device->type != DEV_TYPE_ICU_XCU) &&
430	(device->type != DEV_TYPE_MMC_TSR) &&
431	(device->type != DEV_TYPE_DMA_SCL) &&
432	(device->type != DEV_TYPE_TXT_MTY) &&
433	(device->type != DEV_TYPE_IOC_SPI) )
434	{
435	boot_dev = &boot_info->ext_dev[device_id];
436
437	boot_dev->type = device->type;
438	boot_dev->base = device->base;
439	boot_dev->channels = device->channels;
440	boot_dev->param0 = device->arg0;
441	boot_dev->param1 = device->arg1;
442	boot_dev->param2 = device->arg2;
443	boot_dev->param3 = device->arg3;
444	boot_dev->irqs = device->irqs;
445
446	device_id++;
447
448	#if DEBUG_BOOT_INFO
449	boot_printf(" - %s : base = %l / size = %l / channels = %d / irqs = %d\n",
450	device_type_str(device->type), device->base, device->size, device->channels, device->irqs );
451	#endif
452	}
453
454	// handle IRQs for PIC
455	if (device->type == DEV_TYPE_PIC_TSR)
456	{
457	for (irq_id = 0; irq_id < CONFIG_MAX_EXTERNAL_IRQS ; irq_id++)
458	{
459	boot_dev->irq[irq_id].valid = 0;
460	}
461
462	for (irq = &irq_base[device->irq_offset];
463	irq < &irq_base[device->irq_offset + device->irqs];
464	irq++)
465	{
466	boot_dev->irq[irq->port].valid = 1;
467	boot_dev->irq[irq->port].dev_type = irq->dev_type;
468	boot_dev->irq[irq->port].channel = irq->channel;
469	boot_dev->irq[irq->port].is_rx = irq->is_rx;
470
471	#if DEBUG_BOOT_INFO
472	boot_printf(" . irq_port = %d / source = %s / channel = %d / is_rx = %d\n",
473	irq->port , device_type_str( irq->dev_type ) , irq->channel , irq->is_rx );
474	#endif
475	}
476	}
477	} // end loop on io_cluster peripherals
478
479	// initialize number of external peripherals
480	boot_info->ext_dev_nr = device_id;
481
482	// Initialize cluster specific resources
483	boot_info->cxy = my_cluster->cxy;
484
485	#if DEBUG_BOOT_INFO
486	boot_printf("\n[BOOT INFO] %s : cores in cluster %x\n", __FUNCTION__ , cxy );
487	#endif
488
489	////////////////////////////////////////
490	// Initialize array of core descriptors
491	core_id = 0;
492	for (core = &core_base[my_cluster->core_offset];
493	core < &core_base[my_cluster->core_offset + my_cluster->cores];
494	core++ )
495	{
496	boot_info->core[core_id].gid = (gid_t)core->gid;
497	boot_info->core[core_id].lid = (lid_t)core->lid;
498	boot_info->core[core_id].cxy = (cxy_t)core->cxy;
499
500	#if DEBUG_BOOT_INFO
501	boot_printf(" - core_gid = %x : cxy = %x / lid = %d\n",
502	core->gid , core->cxy , core->lid );
503	#endif
504	core_id++;
505	}
506
507	// Initialize number of cores in my_cluster
508	boot_info->cores_nr = core_id;
509
510	//////////////////////////////////////////////////////////////////////
511	// initialise boot_info array of internal devices (RAM, ICU, MMC, DMA)
512
513	#if DEBUG_BOOT_INFO
514	boot_printf("\n[BOOT INFO] %s : internal peripherals in cluster %x\n",
515	__FUNCTION__ , cxy );
516	#endif
517
518	device_id = 0;
519	for (device = &device_base[my_cluster->device_offset];
520	device < &device_base[my_cluster->device_offset + my_cluster->devices];
521	device++ )
522	{
523	// keep only internal devices
524	if( (device->type == DEV_TYPE_RAM_SCL) \|\|
525	(device->type == DEV_TYPE_ICU_XCU) \|\|
526	(device->type == DEV_TYPE_MMC_TSR) \|\|
527	(device->type == DEV_TYPE_DMA_SCL) \|\|
528	(device->type == DEV_TYPE_TXT_MTY) \|\|
529	(device->type == DEV_TYPE_IOC_SPI) )
530	{
531	if (device->type == DEV_TYPE_RAM_SCL) // RAM
532	{
533	// set number of physical memory pages
534	boot_info->pages_nr = device->size >> CONFIG_PPM_PAGE_ORDER;
535
536	#if DEBUG_BOOT_INFO
537	boot_printf(" - RAM : %x pages\n", boot_info->pages_nr );
538	#endif
539	}
540	else // ICU / MMC / DMA / MTY
541	{
542	if( device_id >= CONFIG_MAX_INT_DEV )
543	{
544	boot_printf("\n[ERROR] in %s : too much internal devices in cluster %x\n",
545	__FUNCTION__ , cxy );
546	boot_exit();
547	}
548
549	boot_dev = &boot_info->int_dev[device_id];
550
551	boot_dev->type = device->type;
552	boot_dev->base = device->base;
553	boot_dev->channels = device->channels;
554	boot_dev->param0 = device->arg0;
555	boot_dev->param1 = device->arg1;
556	boot_dev->param2 = device->arg2;
557	boot_dev->param3 = device->arg3;
558	boot_dev->irqs = device->irqs;
559
560	device_id++;
561
562	#if DEBUG_BOOT_INFO
563	boot_printf(" - %s : base = %l / size = %l / channels = %d / irqs = %d\n",
564	device_type_str( device->type ) , device->base , device->size ,
565	device->channels , device->irqs );
566	#endif
567
568	// handle IRQs for ICU
569	if (device->type == DEV_TYPE_ICU_XCU)
570	{
571	for (irq_id = 0; irq_id < CONFIG_MAX_INTERNAL_IRQS ; irq_id++)
572	{
573	boot_dev->irq[irq_id].valid = 0;
574	}
575
576	for (irq = &irq_base[device->irq_offset];
577	irq < &irq_base[device->irq_offset + device->irqs] ; irq++)
578	{
579	boot_dev->irq[irq->port].valid = 1;
580	boot_dev->irq[irq->port].dev_type = irq->dev_type;
581	boot_dev->irq[irq->port].channel = irq->channel;
582	boot_dev->irq[irq->port].is_rx = irq->is_rx;
583
584	#if DEBUG_BOOT_INFO
585	boot_printf(" . irq_port = %d / source = %s / channel = %d / is_rx = %d\n",
586	irq->port , device_type_str( irq->dev_type ) , irq->channel , irq->is_rx );
587	#endif
588
589	}
590	}
591	}
592	}
593	} // end loop on local peripherals
594
595	// initialize number of internal peripherals
596	boot_info->int_dev_nr = device_id;
597
598	// Get the top address of the kernel segments
599	end = boot_info->kdata_base + boot_info->kdata_size;
600
601	// compute number of physical pages occupied by the kernel code
602	boot_info->pages_offset = ( (end & CONFIG_PPM_PAGE_MASK) == 0 ) ?
603	(end >> CONFIG_PPM_PAGE_ORDER) : (end >> CONFIG_PPM_PAGE_ORDER) + 1;
604
605	// no reserved zones for TSAR architecture
606	boot_info->rsvd_nr = 0;
607
608	// set boot_info signature
609	boot_info->signature = BOOT_INFO_SIGNATURE;
610
611	} // boot_info_init()
612
613	/***********************************************************************************
614	* This function check the local boot_info_t structure for a given core.
615	* @ boot_info : pointer to local 'boot_info_t' structure to be checked.
616	* @ lid : core local identifier, index the core descriptor table.
617	**********************************************************************************/
618	static void boot_check_core( boot_info_t * boot_info,
619	lid_t lid)
620	{
621	gid_t gid; // global hardware identifier of this core
622	boot_core_t * this; // BOOT_INFO core descriptor of this core.
623
624	// Get core hardware identifier
625	gid = (gid_t)boot_get_procid();
626
627	// get pointer on core descriptor
628	this = &boot_info->core[lid];
629
630	if ( (this->gid != gid) \|\| (this->cxy != boot_info->cxy) )
631	{
632	boot_printf("\n[BOOT ERROR] in boot_check_core() :\n"
633	" - boot_info cxy = %x\n"
634	" - boot_info lid = %d\n"
635	" - boot_info gid = %x\n"
636	" - actual gid = %x\n",
637	this->cxy , this->lid , this->gid , gid );
638	boot_exit();
639	}
640
641	} // boot_check_core()
642
643	/*********************************************************************************
644	* This function is called by CP0 in cluster(0,0) to activate all other CP0s.
645	* It returns the number of CP0s actually activated.
646	********************************************************************************/
647	static uint32_t boot_wake_all_cp0s( void )
648	{
649	archinfo_header_t* header; // Pointer on ARCHINFO header
650	archinfo_cluster_t* cluster_base; // Pointer on ARCHINFO clusters base
651	archinfo_cluster_t* cluster; // Iterator for loop on clusters
652	archinfo_device_t* device_base; // Pointer on ARCHINFO devices base
653	archinfo_device_t* device; // Iterator for loop on devices
654	uint32_t cp0_nb = 0; // CP0s counter
655
656	header = (archinfo_header_t*)ARCHINFO_BASE;
657	cluster_base = archinfo_get_cluster_base(header);
658	device_base = archinfo_get_device_base (header);
659
660	// loop on all clusters
661	for (cluster = cluster_base;
662	cluster < &cluster_base[header->x_size * header->y_size];
663	cluster++)
664	{
665	// Skip boot cluster.
666	if (cluster->cxy == BOOT_CORE_CXY)
667	continue;
668
669	// Skip clusters without core (thus without CP0).
670	if (cluster->cores == 0)
671	continue;
672
673	// Skip clusters without device (thus without XICU).
674	if (cluster->devices == 0)
675	continue;
676
677	// search XICU device associated to CP0, and send a WTI to activate it
678	for (device = &device_base[cluster->device_offset];
679	device < &device_base[cluster->device_offset + cluster->devices];
680	device++)
681	{
682	if (device->type == DEV_TYPE_ICU_XCU)
683	{
684
685	#if DEBUG_BOOT_WAKUP
686	boot_printf("\n[BOOT] core[%x,0] activated at cycle %d\n",
687	cluster->cxy , boot_get_proctime );
688	#endif
689
690	boot_remote_sw((xptr_t)device->base, (uint32_t)boot_entry);
691	cp0_nb++;
692	}
693	}
694	}
695	return cp0_nb;
696
697	} // boot_wake_cp0()
698
699	/*********************************************************************************
700	* This function is called by all CP0s to activate the other CPi cores.
701	* @ boot_info : pointer to local 'boot_info_t' structure.
702	*********************************************************************************/
703	static void boot_wake_local_cores(boot_info_t * boot_info)
704	{
705	unsigned int core_id;
706
707	// get pointer on XCU device descriptor in boot_info
708	boot_device_t * xcu = &boot_info->int_dev[0];
709
710	// loop on cores
711	for (core_id = 1; core_id < boot_info->cores_nr; core_id++)
712	{
713
714	#if DEBUG_BOOT_WAKUP
715	boot_printf("\n[BOOT] core[%x,%d] activated at cycle %d\n",
716	boot_info->cxy , core_id , boot_get_proctime() );
717	#endif
718	// send an IPI
719	boot_remote_sw( (xptr_t)(xcu->base + (core_id << 2)) , (uint32_t)boot_entry );
720	}
721	} // boot_wake_local_cores()
722
723	/*********************************************************************************
724	* This function is called by all core[cxy][0] to initialize the Boot Page Table:
725	* map two local big pages for the boot code and kernel code.
726	* @ cxy : local cluster identifier.
727	*********************************************************************************/
728	void boot_page_table_init( cxy_t cxy )
729	{
730	// set PTE1 in slot[0] for kernel code
731	uint32_t kernel_attr = 0x8A800000; // flagss : V,C,X,G
732	uint32_t kernel_ppn1 = (cxy << 20) >> 9; // big physical page index == 0
733	boot_pt[0] = kernel_attr \| kernel_ppn1;
734
735	// set PTE1 in slot[1] for boot code (no global flag)
736	uint32_t boot_attr = 0x8A000000; // flags : V,C,X
737	uint32_t boot_ppn1 = ((cxy << 20) + 512) >> 9; // big physical page index == 1
738	boot_pt[1] = boot_attr \| boot_ppn1;
739	}
740
741	/*********************************************************************************
742	* This function is called by all cores to activate the instruction MMU,
743	* and use the local copy of boot code.
744	*********************************************************************************/
745	void boot_activate_ins_mmu( cxy_t cxy )
746	{
747	// set mmu_ptpr register
748	uint32_t ptpr = ((uint32_t)boot_pt >> 13) \| (cxy << 19);
749	asm volatile ( "mtc2 %0, $0 \n" : : "r" (ptpr) );
750
751	// set ITLB bit in mmu_mode
752	asm volatile ( "mfc2 $26, $1 \n"
753	"ori $26, $26, 0x8 \n"
754	"mtc2 $26, $1 \n" );
755	}
756
757	/*********************************************************************************
758	* This main function of the boot-loader is called by the boot_entry()
759	* function, and executed by all cores.
760	* The arguments values are computed by the boot_entry code.
761	* @ lid : core local identifier,
762	* @ cxy : cluster identifier,
763	*********************************************************************************/
764	void boot_loader( lid_t lid,
765	cxy_t cxy )
766	{
767	boot_info_t * boot_info; // pointer on local boot_info_t structure
768
769	if (lid == 0)
770	{
771	/**********************************i********************
772	* PHASE Sequencial : only core[0,0] executes it
773	**********************************************************/
774	if (cxy == 0)
775	{
776	// Initialize IOC driver
777	if (USE_IOC_BDV) boot_bdv_init();
778	else if (USE_IOC_HBA) boot_hba_init();
779	// else if (USE_IOC_SDC) boot_sdc_init();
780	// else if (USE_IOC_SPI) boot_spi_init();
781	else if (!USE_IOC_RDK)
782	{
783	boot_printf("\n[BOOT ERROR] in %s : no IOC driver\n");
784	boot_exit();
785	}
786
787	// Initialize FAT32.
788	boot_fat32_init();
789
790	// Load the 'kernel.elf' file into memory from IOC, and set
791	// the global variables defining the kernel layout
792	boot_kernel_load();
793
794	boot_printf("\n[BOOT] core[%x,%d] loaded kernel at cycle %d\n",
795	cxy , lid , boot_get_proctime() );
796
797	// Load the arch_info.bin file into memory.
798	boot_archinfo_load();
799
800	boot_printf("\n[BOOT] core[%x,%d] loaded arch_info at cycle %d\n",
801	cxy , lid , boot_get_proctime() );
802
803	// Get local boot_info_t structure base address.
804	// It is the first structure in the .kdata segment.
805	boot_info = (boot_info_t *)seg_kdata_base;
806
807	// Initialize local boot_info_t structure.
808	boot_info_init( boot_info , cxy );
809
810	boot_printf("\n[BOOT] core[%x,%d] initialised boot_info at cycle %d\n",
811	cxy , lid , boot_get_proctime() );
812
813	// check boot_info signature
814	if (boot_info->signature != BOOT_INFO_SIGNATURE)
815	{
816	boot_printf("\n[BOOT ERROR] in %s reported by core[%x,%d]\n"
817	" illegal boot_info signature / should be %x\n",
818	__FUNCTION__ , cxy , lid , BOOT_INFO_SIGNATURE );
819	boot_exit();
820	}
821
822	// Check core information.
823	boot_check_core(boot_info, lid);
824
825	// identity maps two big pages for the boot and kernel code,
826	boot_page_table_init( 0 );
827
828	// activate the instruction MMU to use the local copy of boot code
829	boot_activate_ins_mmu( 0 );
830
831	// Activate other core[cxy,0] / set number of activated cores
832	active_cores_nr = boot_wake_all_cp0s() + 1;
833
834	// Wait until all clusters (i.e all core[cxy,0]) ready to enter kernel.
835	boot_remote_barrier( XPTR( BOOT_CORE_CXY , &global_barrier ) ,
836	active_cores_nr );
837
838	// activate other local cores
839	boot_wake_local_cores( boot_info );
840
841	// Wait until all local cores in cluster ready
842	boot_remote_barrier( XPTR( cxy , &local_barrier ) ,
843	boot_info->cores_nr );
844	}
845	/**************************************************************************
846	* PHASE partially parallel : all core[cxy,0] with (cxy != 0) execute it
847	**************************************************************************/
848	else
849	{
850	// at this point, the DATA extension registers point
851	// on the local cluster cxy to use the local stack,
852	// but all cores must access the code stored in cluster 0
853
854	// Each core[cxy,0] copies the boot code (data and instructions)
855	// from the cluster 0 to the local cluster.
856	boot_remote_memcpy( XPTR( cxy , BOOT_BASE ),
857	XPTR( BOOT_CORE_CXY , BOOT_BASE ),
858	BOOT_MAX_SIZE );
859
860	// from now, it is safe to refer to the boot global variables
861
862	#if DEBUG_BOOT_MULTI
863	boot_printf("\n[BOOT] core[%x,%d] replicated boot code at cycle %d\n",
864	cxy , lid , boot_get_proctime() );
865	#endif
866	// identity maps two big pages for the boot and kernel code,
867	boot_page_table_init( cxy );
868
869	// activate the instruction MMU to use the local copy of boot code
870	boot_activate_ins_mmu( cxy );
871
872	// Each core[cxy,0] copies the arch_info.bin into the local memory.
873	boot_remote_memcpy(XPTR(cxy, ARCHINFO_BASE),
874	XPTR(BOOT_CORE_CXY, ARCHINFO_BASE),
875	ARCHINFO_MAX_SIZE );
876	#if DEBUG_BOOT_MULTI
877	boot_printf("\n[BOOT] core[%x,%d] replicated arch_info at cycle %d\n",
878	cxy , lid , boot_get_proctime() );
879	#endif
880	// copy the kcode segment into local memory
881	boot_remote_memcpy( XPTR( cxy , seg_kcode_base ),
882	XPTR( BOOT_CORE_CXY , seg_kcode_base ),
883	seg_kcode_size );
884
885	// Each core[cxy,0] copies the kdata segment into local memory
886	boot_remote_memcpy( XPTR( cxy , seg_kdata_base ),
887	XPTR( BOOT_CORE_CXY , seg_kdata_base ),
888	seg_kdata_size );
889	#if DEBUG_BOOT_MULTI
890	boot_printf("\n[BOOT] core[%x,%d] replicated kernel code at cycle %d\n",
891	cxy , lid , boot_get_proctime() );
892	#endif
893	// Each core[cxy,0] get local boot_info_t structure base address.
894	boot_info = (boot_info_t*)seg_kdata_base;
895
896	// Each core[cxy,0] initializes local boot_info_t structure.
897	boot_info_init( boot_info , cxy );
898
899	#if DEBUG_BOOT_MULTI
900	boot_printf("\n[BOOT] core[%x,%d] initialised boot_info at cycle %d\n",
901	cxy , lid , boot_get_proctime() );
902	#endif
903	// Each core[cxy,0] checks core information.
904	boot_check_core( boot_info , lid );
905
906	// Each core[cxy,0] get number of active clusters from BOOT_CORE cluster
907	uint32_t count = boot_remote_lw( XPTR( 0 , &active_cores_nr ) );
908
909	// Wait until all clusters (i.e all CP0s) ready
910	boot_remote_barrier( XPTR( BOOT_CORE_CXY , &global_barrier ) , count );
911
912	// activate other local cores
913	boot_wake_local_cores( boot_info );
914
915	// Wait until all local cores in cluster ready
916	boot_remote_barrier( XPTR( cxy , &local_barrier ) ,
917	boot_info->cores_nr );
918	}
919	}
920	else
921	{
922	/***********************************************************************
923	* PHASE fully parallel : all cores[cxy,lid] with (lid! = 0) execute it
924	**********************************************************************/
925
926	// activate the instruction MMU to use the local copy of the boot code
927	boot_activate_ins_mmu( cxy );
928
929	// Get local boot_info_t structure base address.
930	boot_info = (boot_info_t *)seg_kdata_base;
931
932	// Check core information
933	boot_check_core(boot_info, lid);
934
935	// Wait until all local cores in cluster ready
936	boot_remote_barrier( XPTR( cxy , &local_barrier ) , boot_info->cores_nr );
937	}
938
939	// All cores enter the kernel_init() function. The address is contained in
940	// the "kernel_entry" global variable, set by boot_kernel_load() function.
941	// Each core initialise the following registers before jumping to kernel:
942	// - gr_29 : stack pointer / kernel stack allocated in idle thread descriptor,
943	// - c0_sr : status register / reset BEV bit
944	// - gr_04 : kernel_init() argument / pointer on boot_info structure
945	// The array of idle-thread descriptors is allocated in the kdata segment,
946	// just after the boot_info structure.
947
948	#if DEBUG_BOOT_MULTI
949	boot_printf("\n[BOOT] core[%x,%d] jump to kernel_init = %x at cycle %d\n",
950	cxy, lid, kernel_entry, boot_get_proctime() );
951	#endif
952
953	uint32_t base;
954	uint32_t offset = sizeof( boot_info_t );
955	uint32_t pmask = CONFIG_PPM_PAGE_MASK;
956	uint32_t psize = CONFIG_PPM_PAGE_SIZE;
957	if( offset & pmask ) base = seg_kdata_base + (offset & ~pmask) + psize;
958	else base = seg_kdata_base + offset;
959	uint32_t sp = base + ((lid + 1) * CONFIG_THREAD_DESC_SIZE) - 16;
960
961	asm volatile( "mfc0 $27, $12 \n"
962	"lui $26, 0xFFBF \n"
963	"ori $26, $26, 0xFFFF \n"
964	"and $27, $27, $26 \n"
965	"mtc0 $27, $12 \n"
966	"move $4, %0 \n"
967	"move $29, %1 \n"
968	"jr %2 \n"
969	:
970	: "r"(boot_info) ,
971	"r"(sp) ,
972	"r"(kernel_entry)
973	: "$26" , "$27" , "$29" , "$4" );
974
975
976	} // boot_loader()

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source: trunk/boot/tsar_mips32/boot.c

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