source: trunk/libs/newlib/src/libgloss/aarch64/cpu-init/rdimon-aem-el3.S @ 688

Last change on this file since 688 was 444, checked in by satin@…, 6 years ago

add newlib,libalmos-mkh, restructure shared_syscalls.h and mini-libc

File size: 4.5 KB
Line 
1/* Copyright (c) 2009, 2010, 2011, 2012 ARM Ltd.  All rights reserved.
2
3 Redistribution and use in source and binary forms, with or without
4 modification, are permitted provided that the following conditions
5 are met:
6 1. Redistributions of source code must retain the above copyright
7    notice, this list of conditions and the following disclaimer.
8 2. Redistributions in binary form must reproduce the above copyright
9    notice, this list of conditions and the following disclaimer in the
10    documentation and/or other materials provided with the distribution.
11 3. The name of the company may not be used to endorse or promote
12    products derived from this software without specific prior written
13    permission.
14
15 THIS SOFTWARE IS PROVIDED BY ARM LTD ``AS IS'' AND ANY EXPRESS OR IMPLIED
16 WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
17 MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 IN NO EVENT SHALL ARM LTD BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
19 SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
20 TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
21 PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
22 LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
23 NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
24 SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */
25
26#include "newlib.h"
27#include "svc.h"
28
29/* ANSI concatenation macros.  */
30#define CONCAT(a, b) CONCAT2(a, b)
31#define CONCAT2(a, b) a ## b
32
33#ifdef __USER_LABEL_PREFIX__
34#define FUNCTION( name ) CONCAT (__USER_LABEL_PREFIX__, name)
35#else
36#error __USER_LABEL_PREFIX is not defined
37#endif
38
39
40        .text
41        .align 2
42_init_vectors:
43        /* Installs a table of exception vectors to catch and handle all
44           exceptions by terminating the process with a diagnostic.  */
45        adr     x0, vectors
46        msr     vbar_el3, x0
47        msr     vbar_el2, x0
48        msr     vbar_el1, x0
49        ret
50
51curr_sp0_sync:
52curr_sp0_irq:
53curr_sp0_fiq:
54curr_sp0_serror:
55curr_spx_sync:
56curr_spx_irq:
57curr_spx_fiq:
58curr_spx_serror:
59lower_a64_sync:
60lower_a64_irq:
61lower_a64_fiq:
62lower_a64_serror:
63lower_a32_sync:
64lower_a32_irq:
65lower_a32_fiq:
66lower_a32_serror:
67        mov     x0, 2
68        adr     x1, .LC3
69        mov     x2, 26
70        bl      FUNCTION (write)
71        mov     x0,  126
72        b       FUNCTION (exit)         /* Cannot return.  */
73.LC3:
74        .string "Terminated by exception.\n"
75
76        .macro  ventry  label
77        .align  7
78        b       \label
79        .endm
80
81        /* AArch64 Exception Model -- 3.5.5 Exception Vectors.  */
82
83        .align  12
84vectors:
85        /* Current EL with SP0.  */
86        ventry  curr_sp0_sync           /* Synchronous  */
87        ventry  curr_sp0_irq            /* Irq/vIRQ  */
88        ventry  curr_sp0_fiq            /* Fiq/vFIQ  */
89        ventry  curr_sp0_serror         /* SError/VSError  */
90
91        /* Current EL with SPx.  */
92        ventry  curr_spx_sync           /* Synchronous  */
93        ventry  curr_spx_irq            /* IRQ/vIRQ  */
94        ventry  curr_spx_fiq            /* FIQ/vFIQ  */
95        ventry  curr_spx_serror         /* SError/VSError  */
96
97        /* Lower EL using AArch64.  */
98        ventry  lower_a64_sync          /* Synchronous  */
99        ventry  lower_a64_irq           /* IRQ/vIRQ  */
100        ventry  lower_a64_fiq           /* FIQ/vFIQ  */
101        ventry  lower_a64_serror        /* SError/VSError  */
102
103        /* Lower EL using AArch32.  */
104        ventry  lower_a32_sync          /* Synchronous  */
105        ventry  lower_a32_irq           /* IRQ/vIRQ  */
106        ventry  lower_a32_fiq           /* FIQ/vFIQ  */
107        ventry  lower_a32_serror        /* SError/VSError  */
108
109
110        .text
111        .align 2
112_flat_map:
113        /* Page table setup (identity mapping).  */
114        adrp    x0, ttb
115        add     x0, x0, :lo12:ttb
116        msr     ttbr0_el3, x0
117        adr     x1, .                           /* phys address */
118        bic     x1, x1, #(1 << 30) - 1          /* 1GB block alignment */
119        add     x2, x0, x1, lsr #(30 - 3)       /* offset in level 1 page
120                                                   table */
121        mov     x3, #0x401                      /* page table attributes
122                                                   (AF, block) */
123        orr     x1, x1, x3
124        mov     x3, #(1 << 30)                  /* 1GB block */
125        str     x1, [x2], #8                    /* 1st GB */
126        add     x1, x1, x3
127        str     x1, [x2]                        /* 2nd GB */
128
129        /* Setup/enable the MMU.  */
130
131        /* RES1, RES1, 40-bit PA, 39-bit VA, inner/outer cacheable WB */
132        ldr     x0, =(1 << 31) | (1 << 23) | (2 << 16) | 25 | (3 << 10) | (3 << 8)
133        msr     tcr_el3, x0
134
135        mov     x0, #0xee                       /* Inner/outer cacheable WB */
136        msr     mair_el3, x0
137        isb
138
139        mrs     x0, sctlr_el3
140        ldr     x1, =0x100d                     /* bits I(12) SA(3) C(2) M(0) */
141        bic     x0, x0, #(1 << 1)               /* clear bit A(1) */
142        bic     x0, x0, #(1 << 19)              /* clear WXN */
143        orr     x0, x0, x1                      /* set bits */
144
145        dsb     sy
146        msr     sctlr_el3, x0
147        isb
148        ret
149
150        .data
151        .align  12
152ttb:
153        .space  4096, 0
154
155
156        .text
157        .align 2
158        .global FUNCTION (_cpu_init_hook)
159        .type   FUNCTION (_cpu_init_hook), %function
160FUNCTION (_cpu_init_hook):
161        sub     sp, sp, #16
162        str     x30, [sp, xzr]
163        bl      _init_vectors
164        bl      _flat_map
165        ldr     x30, [sp, xzr]
166        add     sp, sp, #16
167        ret
168        .size   FUNCTION (_cpu_init_hook), .-FUNCTION (_cpu_init_hook)
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