source: trunk/hal/generic/hal_special.h @ 295

Last change on this file since 295 was 279, checked in by alain, 7 years ago

1) Introduce independant command fields for the various devices in the thread descriptor.
2) Introduce a new dev_pic_enable_ipi() function in the generic PIC device
3) Fix two bugs identified by Maxime in the scheduler initialisation, and in the sched_select().
4) fix several bugs in the TSAR hal_kentry.S.
5) Introduce a third kgiet segment (besides kdata and kcode) in the TSAR bootloader.
File size: 7.2 KB
Line 
1/*
2 * hal_special.h - Generic Special Registers Access API definition.
3 *
4 * Authors   Alain Greiner    (2016,2017)
5 *
6 * Copyright (c)  UPMC Sorbonne Universites
7 *
8 * This file is part of ALMOS-MKH.
9 *
10 * ALMOS-MKH is free software; you can redistribute it and/or modify it
11 * under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; version 2.0 of the License.
13 *
14 * ALMOS-MKH is distributed in the hope that it will be useful, but
15 * WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
17 * General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with ALMOS-MKH; if not, write to the Free Software Foundation,
21 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
22 */
23
24#ifndef  _HAL_CPU_H_
25#define  _HAL_CPU_H_
26
27#include <hal_types.h>
28
29/****  Forward declarations  ***/
30
31struct thread_s;
32
33///////////////////////////////////////////////////////////////////////////////////////////
34//      Generic Special Registers Access API (implementation in hal_special.c)
35//
36// ALMOS-MKH uses the following API to access the MMU and other core protected registers.
37///////////////////////////////////////////////////////////////////////////////////////////
38
39/*****************************************************************************************
40 * This function returns the calling core status register value.
41 ****************************************************************************************/
42inline reg_t hal_get_sr();
43
44/*****************************************************************************************
45 * This function returns the global core identifier from the calling core register.
46 ****************************************************************************************/
47inline gid_t hal_get_gid();
48
49/*****************************************************************************************
50 * This function returns the current value of the hardware cycles counter.
51 ****************************************************************************************/
52inline cycle_t hal_time_stamp();
53
54/*****************************************************************************************
55 * This function returns the content of the calling core private cycles counter.
56 * This cycle counter is reset when the core is initialised (at each boot).
57 * If the hardware counter is not a 64 bits register, this function must handle overflow.
58 ****************************************************************************************/
59uint64_t hal_get_cycles();
60
61/*****************************************************************************************
62 * This function returns the current thread pointer from the calling core register.
63 ****************************************************************************************/
64inline struct thread_s * hal_get_current_thread();
65
66/*****************************************************************************************
67 * This function registers a thread pointer in the calling core register.
68 ****************************************************************************************/
69void hal_set_current_thread( struct thread_s * thread );
70
71/*****************************************************************************************
72 * This function writes into the proper core register to enable the floating point unit.
73 ****************************************************************************************/
74void hal_fpu_enable();
75
76/*****************************************************************************************
77 * This function writes into the proper core register to disable the floating point unit.
78 ****************************************************************************************/
79void hal_fpu_disable();
80
81/*****************************************************************************************
82 * This function returns the current value of stack pointer from core register.
83 ****************************************************************************************/
84uint32_t hal_get_stack();
85
86/*****************************************************************************************
87 * This function registers a new value in the core stack pointer and returns previous one.
88 ****************************************************************************************/
89extern inline uint32_t hal_set_stack( void * new_val );
90
91/*****************************************************************************************
92 * This function returns the faulty address in case of address exception.
93 ****************************************************************************************/
94uint32_t hal_get_bad_vaddr();
95
96/*****************************************************************************************
97 * This function makes an uncachable read to a 32 bits variable in local memory.
98 * @ ptr     : pointer on the variable
99 * @ returns the value
100 ****************************************************************************************/
101uint32_t hal_uncached_read( uint32_t * ptr );
102
103/*****************************************************************************************
104 * This function invalidates the cache line containing a given address.
105 * @ ptr     : address in local memory
106 ****************************************************************************************/
107void hal_invalid_dcache_line( void * ptr );
108
109/*****************************************************************************************
110 * This blocking function flushes the write buffer to synchronize all pending writes.
111 ****************************************************************************************/
112void hal_fence();
113
114/*****************************************************************************************
115 * This forbids code reordering by the compiler.
116 ****************************************************************************************/
117void hal_rdbar();
118
119/*****************************************************************************************
120 * This function forces the calling core in idle-low-power mode.
121 ****************************************************************************************/
122void hal_core_sleep();
123
124/*****************************************************************************************
125 * This function returns after a fixed delay of (4 * delay) cycles.
126 ****************************************************************************************/
127void hal_fixed_delay();
128
129/*****************************************************************************************
130 * This function returns information on MMU exceptions :
131 * @ mmu_ins_excp_code : [out] instruction fetch exception code
132 * @ mmu_ins_bad_vaddr : [out] instruction fetch faulty virtual address
133 * @ mmu_dat_excp_code : [out] data access exception code
134 * @ mmu_dat_bad_vaddr : [out] data access faulty virtual address
135 ****************************************************************************************/
136void hal_get_mmu_excp( intptr_t * mmu_ins_excp_code,
137                       intptr_t * mmu_ins_bad_vaddr,
138                       intptr_t * mmu_dat_excp_code,
139                       intptr_t * mmu_dat_bad_vaddr );
140
141
142#endif  /* _HAL_SPECIAL_H_ */
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