wdenk | 2262cfe | 2002-11-18 00:14:45 +0000 | [diff] [blame] | 1 | /* |
Bin Meng | fe0c33a | 2014-12-12 21:05:22 +0800 | [diff] [blame] | 2 | * U-Boot - x86 Startup Code |
wdenk | 2262cfe | 2002-11-18 00:14:45 +0000 | [diff] [blame] | 3 | * |
Graeme Russ | dbf7115 | 2011-04-13 19:43:26 +1000 | [diff] [blame] | 4 | * (C) Copyright 2008-2011 |
| 5 | * Graeme Russ, <graeme.russ@gmail.com> |
| 6 | * |
| 7 | * (C) Copyright 2002 |
Albert ARIBAUD | fa82f87 | 2011-08-04 18:45:45 +0200 | [diff] [blame] | 8 | * Daniel Engström, Omicron Ceti AB, <daniel@omicron.se> |
wdenk | 2262cfe | 2002-11-18 00:14:45 +0000 | [diff] [blame] | 9 | * |
Wolfgang Denk | 1a45966 | 2013-07-08 09:37:19 +0200 | [diff] [blame] | 10 | * SPDX-License-Identifier: GPL-2.0+ |
wdenk | 2262cfe | 2002-11-18 00:14:45 +0000 | [diff] [blame] | 11 | */ |
| 12 | |
wdenk | 2262cfe | 2002-11-18 00:14:45 +0000 | [diff] [blame] | 13 | #include <config.h> |
Graeme Russ | 161b358 | 2010-10-07 20:03:29 +1100 | [diff] [blame] | 14 | #include <asm/global_data.h> |
Simon Glass | d1cd045 | 2014-11-12 22:42:09 -0700 | [diff] [blame] | 15 | #include <asm/post.h> |
Graeme Russ | 109ad14 | 2011-12-31 10:24:36 +1100 | [diff] [blame] | 16 | #include <asm/processor.h> |
Graeme Russ | 0c24c9c | 2011-02-12 15:11:32 +1100 | [diff] [blame] | 17 | #include <asm/processor-flags.h> |
Graeme Russ | 9e6c572 | 2011-12-31 22:58:15 +1100 | [diff] [blame] | 18 | #include <generated/generic-asm-offsets.h> |
Bin Meng | fe0c33a | 2014-12-12 21:05:22 +0800 | [diff] [blame] | 19 | #include <generated/asm-offsets.h> |
wdenk | 2262cfe | 2002-11-18 00:14:45 +0000 | [diff] [blame] | 20 | |
wdenk | 2262cfe | 2002-11-18 00:14:45 +0000 | [diff] [blame] | 21 | .section .text |
| 22 | .code32 |
| 23 | .globl _start |
wdenk | 8bde7f7 | 2003-06-27 21:31:46 +0000 | [diff] [blame] | 24 | .type _start, @function |
Graeme Russ | fea2572 | 2011-04-13 19:43:28 +1000 | [diff] [blame] | 25 | .globl _x86boot_start |
| 26 | _x86boot_start: |
Graeme Russ | 077e195 | 2010-04-24 00:05:42 +1000 | [diff] [blame] | 27 | /* |
Simon Glass | da3a95d | 2015-07-31 09:31:25 -0600 | [diff] [blame] | 28 | * This is the fail-safe 32-bit bootstrap entry point. |
| 29 | * |
| 30 | * This code is used when booting from another boot loader like |
| 31 | * coreboot or EFI. So we repeat some of the same init found in |
| 32 | * start16. |
Graeme Russ | 077e195 | 2010-04-24 00:05:42 +1000 | [diff] [blame] | 33 | */ |
| 34 | cli |
| 35 | cld |
| 36 | |
Graeme Russ | 2f0e0cd | 2011-11-08 02:33:23 +0000 | [diff] [blame] | 37 | /* Turn off cache (this might require a 486-class CPU) */ |
Graeme Russ | 077e195 | 2010-04-24 00:05:42 +1000 | [diff] [blame] | 38 | movl %cr0, %eax |
Graeme Russ | 0c24c9c | 2011-02-12 15:11:32 +1100 | [diff] [blame] | 39 | orl $(X86_CR0_NW | X86_CR0_CD), %eax |
Graeme Russ | 077e195 | 2010-04-24 00:05:42 +1000 | [diff] [blame] | 40 | movl %eax, %cr0 |
| 41 | wbinvd |
| 42 | |
Gabe Black | 91d82a2 | 2012-11-03 11:41:28 +0000 | [diff] [blame] | 43 | /* Tell 32-bit code it is being entered from an in-RAM copy */ |
Simon Glass | 83ec7de | 2015-07-31 09:31:28 -0600 | [diff] [blame] | 44 | movl $GD_FLG_WARM_BOOT, %ebx |
Gabe Black | 91d82a2 | 2012-11-03 11:41:28 +0000 | [diff] [blame] | 45 | jmp 1f |
Simon Glass | 83ec7de | 2015-07-31 09:31:28 -0600 | [diff] [blame] | 46 | |
| 47 | /* Add a way for tools to discover the _start entry point */ |
| 48 | .align 4 |
| 49 | .long 0x12345678 |
wdenk | 8bde7f7 | 2003-06-27 21:31:46 +0000 | [diff] [blame] | 50 | _start: |
Gabe Black | 91d82a2 | 2012-11-03 11:41:28 +0000 | [diff] [blame] | 51 | /* |
Simon Glass | da3a95d | 2015-07-31 09:31:25 -0600 | [diff] [blame] | 52 | * This is the 32-bit cold-reset entry point, coming from start16. |
Simon Glass | 83ec7de | 2015-07-31 09:31:28 -0600 | [diff] [blame] | 53 | * Set %ebx to GD_FLG_COLD_BOOT to indicate this. |
Gabe Black | 91d82a2 | 2012-11-03 11:41:28 +0000 | [diff] [blame] | 54 | */ |
Simon Glass | 83ec7de | 2015-07-31 09:31:28 -0600 | [diff] [blame] | 55 | movl $GD_FLG_COLD_BOOT, %ebx |
Gabe Black | 91d82a2 | 2012-11-03 11:41:28 +0000 | [diff] [blame] | 56 | 1: |
Simon Glass | f67cd51 | 2014-11-06 13:20:10 -0700 | [diff] [blame] | 57 | /* Save BIST */ |
| 58 | movl %eax, %ebp |
Graeme Russ | 077e195 | 2010-04-24 00:05:42 +1000 | [diff] [blame] | 59 | |
Simon Glass | da3a95d | 2015-07-31 09:31:25 -0600 | [diff] [blame] | 60 | /* Load the segement registers to match the GDT loaded in start16.S */ |
Graeme Russ | 109ad14 | 2011-12-31 10:24:36 +1100 | [diff] [blame] | 61 | movl $(X86_GDT_ENTRY_32BIT_DS * X86_GDT_ENTRY_SIZE), %eax |
Graeme Russ | 8ffb2e8 | 2010-10-07 20:03:21 +1100 | [diff] [blame] | 62 | movw %ax, %fs |
| 63 | movw %ax, %ds |
| 64 | movw %ax, %gs |
| 65 | movw %ax, %es |
| 66 | movw %ax, %ss |
wdenk | 8bde7f7 | 2003-06-27 21:31:46 +0000 | [diff] [blame] | 67 | |
Mike Williams | 1626308 | 2011-07-22 04:01:30 +0000 | [diff] [blame] | 68 | /* Clear the interrupt vectors */ |
Graeme Russ | 077e195 | 2010-04-24 00:05:42 +1000 | [diff] [blame] | 69 | lidt blank_idt_ptr |
| 70 | |
Simon Glass | da3a95d | 2015-07-31 09:31:25 -0600 | [diff] [blame] | 71 | /* |
| 72 | * Critical early platform init - generally not used, we prefer init |
| 73 | * to happen later when we have a console, in case something goes |
| 74 | * wrong. |
| 75 | */ |
wdenk | 2262cfe | 2002-11-18 00:14:45 +0000 | [diff] [blame] | 76 | jmp early_board_init |
Graeme Russ | 88fa0a6 | 2010-10-07 20:03:27 +1100 | [diff] [blame] | 77 | .globl early_board_init_ret |
wdenk | 2262cfe | 2002-11-18 00:14:45 +0000 | [diff] [blame] | 78 | early_board_init_ret: |
Simon Glass | d1cd045 | 2014-11-12 22:42:09 -0700 | [diff] [blame] | 79 | post_code(POST_START) |
wdenk | 8bde7f7 | 2003-06-27 21:31:46 +0000 | [diff] [blame] | 80 | |
Graeme Russ | ed4cba7 | 2011-02-12 15:11:52 +1100 | [diff] [blame] | 81 | /* Initialise Cache-As-RAM */ |
| 82 | jmp car_init |
| 83 | .globl car_init_ret |
| 84 | car_init_ret: |
Bin Meng | bceb9f0 | 2014-12-12 21:05:31 +0800 | [diff] [blame] | 85 | #ifndef CONFIG_HAVE_FSP |
Graeme Russ | ed4cba7 | 2011-02-12 15:11:52 +1100 | [diff] [blame] | 86 | /* |
| 87 | * We now have CONFIG_SYS_CAR_SIZE bytes of Cache-As-RAM (or SRAM, |
| 88 | * or fully initialised SDRAM - we really don't care which) |
| 89 | * starting at CONFIG_SYS_CAR_ADDR to be used as a temporary stack |
Simon Glass | da3a95d | 2015-07-31 09:31:25 -0600 | [diff] [blame] | 90 | * and early malloc() area. The MRC requires some space at the top. |
Simon Glass | 76f90f3 | 2014-11-06 13:20:04 -0700 | [diff] [blame] | 91 | * |
| 92 | * Stack grows down from top of CAR. We have: |
| 93 | * |
| 94 | * top-> CONFIG_SYS_CAR_ADDR + CONFIG_SYS_CAR_SIZE |
Simon Glass | 65dd74a | 2014-11-12 22:42:28 -0700 | [diff] [blame] | 95 | * MRC area |
Simon Glass | 76f90f3 | 2014-11-06 13:20:04 -0700 | [diff] [blame] | 96 | * global_data |
| 97 | * x86 global descriptor table |
| 98 | * early malloc area |
| 99 | * stack |
| 100 | * bottom-> CONFIG_SYS_CAR_ADDR |
Graeme Russ | ed4cba7 | 2011-02-12 15:11:52 +1100 | [diff] [blame] | 101 | */ |
Simon Glass | 65dd74a | 2014-11-12 22:42:28 -0700 | [diff] [blame] | 102 | movl $(CONFIG_SYS_CAR_ADDR + CONFIG_SYS_CAR_SIZE - 4), %esp |
| 103 | #ifdef CONFIG_DCACHE_RAM_MRC_VAR_SIZE |
| 104 | subl $CONFIG_DCACHE_RAM_MRC_VAR_SIZE, %esp |
| 105 | #endif |
Bin Meng | bceb9f0 | 2014-12-12 21:05:31 +0800 | [diff] [blame] | 106 | #else |
| 107 | /* |
Simon Glass | da3a95d | 2015-07-31 09:31:25 -0600 | [diff] [blame] | 108 | * When we get here after car_init(), esp points to a temporary stack |
Bin Meng | bceb9f0 | 2014-12-12 21:05:31 +0800 | [diff] [blame] | 109 | * and esi holds the HOB list address returned by the FSP. |
| 110 | */ |
| 111 | #endif |
Graeme Russ | 8d61625 | 2012-11-27 15:38:36 +0000 | [diff] [blame] | 112 | |
| 113 | /* Reserve space on stack for global data */ |
| 114 | subl $GENERATED_GBL_DATA_SIZE, %esp |
| 115 | |
| 116 | /* Align global data to 16-byte boundary */ |
| 117 | andl $0xfffffff0, %esp |
Simon Glass | d1cd045 | 2014-11-12 22:42:09 -0700 | [diff] [blame] | 118 | post_code(POST_START_STACK) |
Graeme Russ | 8d61625 | 2012-11-27 15:38:36 +0000 | [diff] [blame] | 119 | |
Simon Glass | fbd7282 | 2014-10-10 07:49:15 -0600 | [diff] [blame] | 120 | /* Zero the global data since it won't happen later */ |
| 121 | xorl %eax, %eax |
| 122 | movl $GENERATED_GBL_DATA_SIZE, %ecx |
| 123 | movl %esp, %edi |
| 124 | rep stosb |
| 125 | |
Bin Meng | bceb9f0 | 2014-12-12 21:05:31 +0800 | [diff] [blame] | 126 | #ifdef CONFIG_HAVE_FSP |
Bin Meng | aefaff8 | 2015-06-07 11:33:14 +0800 | [diff] [blame] | 127 | test %esi, %esi |
| 128 | jz skip_hob |
| 129 | |
Bin Meng | bceb9f0 | 2014-12-12 21:05:31 +0800 | [diff] [blame] | 130 | /* Store HOB list */ |
| 131 | movl %esp, %edx |
| 132 | addl $GD_HOB_LIST, %edx |
| 133 | movl %esi, (%edx) |
Bin Meng | bceb9f0 | 2014-12-12 21:05:31 +0800 | [diff] [blame] | 134 | |
Bin Meng | aefaff8 | 2015-06-07 11:33:14 +0800 | [diff] [blame] | 135 | skip_hob: |
| 136 | #endif |
Simon Glass | 76f90f3 | 2014-11-06 13:20:04 -0700 | [diff] [blame] | 137 | /* Setup first parameter to setup_gdt, pointer to global_data */ |
Graeme Russ | 8d61625 | 2012-11-27 15:38:36 +0000 | [diff] [blame] | 138 | movl %esp, %eax |
| 139 | |
| 140 | /* Reserve space for global descriptor table */ |
| 141 | subl $X86_GDT_SIZE, %esp |
| 142 | |
Simon Glass | 76f90f3 | 2014-11-06 13:20:04 -0700 | [diff] [blame] | 143 | /* Align temporary global descriptor table to 16-byte boundary */ |
| 144 | andl $0xfffffff0, %esp |
| 145 | movl %esp, %ecx |
| 146 | |
Simon Glass | 5dbcaa2 | 2014-10-10 07:49:16 -0600 | [diff] [blame] | 147 | #if defined(CONFIG_SYS_MALLOC_F_LEN) |
Simon Glass | da3a95d | 2015-07-31 09:31:25 -0600 | [diff] [blame] | 148 | /* Set up the pre-relocation malloc pool */ |
Simon Glass | 5dbcaa2 | 2014-10-10 07:49:16 -0600 | [diff] [blame] | 149 | subl $CONFIG_SYS_MALLOC_F_LEN, %esp |
| 150 | movl %eax, %edx |
| 151 | addl $GD_MALLOC_BASE, %edx |
| 152 | movl %esp, (%edx) |
| 153 | #endif |
Simon Glass | da3a95d | 2015-07-31 09:31:25 -0600 | [diff] [blame] | 154 | /* Store BIST into global_data */ |
Simon Glass | f67cd51 | 2014-11-06 13:20:10 -0700 | [diff] [blame] | 155 | movl %eax, %edx |
| 156 | addl $GD_BIST, %edx |
| 157 | movl %ebp, (%edx) |
Graeme Russ | 8d61625 | 2012-11-27 15:38:36 +0000 | [diff] [blame] | 158 | |
Simon Glass | da3a95d | 2015-07-31 09:31:25 -0600 | [diff] [blame] | 159 | /* Set second parameter to setup_gdt() */ |
Simon Glass | 76f90f3 | 2014-11-06 13:20:04 -0700 | [diff] [blame] | 160 | movl %ecx, %edx |
Graeme Russ | 8d61625 | 2012-11-27 15:38:36 +0000 | [diff] [blame] | 161 | |
Graeme Russ | 8d61625 | 2012-11-27 15:38:36 +0000 | [diff] [blame] | 162 | /* Setup global descriptor table so gd->xyz works */ |
| 163 | call setup_gdt |
Graeme Russ | 9e6c572 | 2011-12-31 22:58:15 +1100 | [diff] [blame] | 164 | |
Graeme Russ | 96cd664 | 2011-02-12 15:11:54 +1100 | [diff] [blame] | 165 | /* Set parameter to board_init_f() to boot flags */ |
Simon Glass | d1cd045 | 2014-11-12 22:42:09 -0700 | [diff] [blame] | 166 | post_code(POST_START_DONE) |
Graeme Russ | dbf7115 | 2011-04-13 19:43:26 +1000 | [diff] [blame] | 167 | xorl %eax, %eax |
Graeme Russ | 161b358 | 2010-10-07 20:03:29 +1100 | [diff] [blame] | 168 | |
Simon Glass | da3a95d | 2015-07-31 09:31:25 -0600 | [diff] [blame] | 169 | /* Enter, U-Boot! */ |
Graeme Russ | dbf7115 | 2011-04-13 19:43:26 +1000 | [diff] [blame] | 170 | call board_init_f |
wdenk | 2262cfe | 2002-11-18 00:14:45 +0000 | [diff] [blame] | 171 | |
| 172 | /* indicate (lack of) progress */ |
wdenk | 8bde7f7 | 2003-06-27 21:31:46 +0000 | [diff] [blame] | 173 | movw $0x85, %ax |
Graeme Russ | fb00290 | 2011-02-12 15:11:58 +1100 | [diff] [blame] | 174 | jmp die |
| 175 | |
Graeme Russ | f48dd6f | 2012-01-01 15:06:39 +1100 | [diff] [blame] | 176 | .globl board_init_f_r_trampoline |
| 177 | .type board_init_f_r_trampoline, @function |
| 178 | board_init_f_r_trampoline: |
Graeme Russ | fb00290 | 2011-02-12 15:11:58 +1100 | [diff] [blame] | 179 | /* |
| 180 | * SDRAM has been initialised, U-Boot code has been copied into |
| 181 | * RAM, BSS has been cleared and relocation adjustments have been |
| 182 | * made. It is now time to jump into the in-RAM copy of U-Boot |
| 183 | * |
Graeme Russ | f48dd6f | 2012-01-01 15:06:39 +1100 | [diff] [blame] | 184 | * %eax = Address of top of new stack |
Graeme Russ | fb00290 | 2011-02-12 15:11:58 +1100 | [diff] [blame] | 185 | */ |
| 186 | |
Graeme Russ | 8d61625 | 2012-11-27 15:38:36 +0000 | [diff] [blame] | 187 | /* Stack grows down from top of SDRAM */ |
Graeme Russ | fb00290 | 2011-02-12 15:11:58 +1100 | [diff] [blame] | 188 | movl %eax, %esp |
| 189 | |
Graeme Russ | 8d61625 | 2012-11-27 15:38:36 +0000 | [diff] [blame] | 190 | /* Reserve space on stack for global data */ |
| 191 | subl $GENERATED_GBL_DATA_SIZE, %esp |
| 192 | |
| 193 | /* Align global data to 16-byte boundary */ |
| 194 | andl $0xfffffff0, %esp |
| 195 | |
Simon Glass | da3a95d | 2015-07-31 09:31:25 -0600 | [diff] [blame] | 196 | /* Setup first parameter to memcpy() and setup_gdt() */ |
Graeme Russ | 8d61625 | 2012-11-27 15:38:36 +0000 | [diff] [blame] | 197 | movl %esp, %eax |
| 198 | |
Simon Glass | da3a95d | 2015-07-31 09:31:25 -0600 | [diff] [blame] | 199 | /* Setup second parameter to memcpy() */ |
Graeme Russ | 8d61625 | 2012-11-27 15:38:36 +0000 | [diff] [blame] | 200 | fs movl 0, %edx |
| 201 | |
Simon Glass | da3a95d | 2015-07-31 09:31:25 -0600 | [diff] [blame] | 202 | /* Set third parameter to memcpy() */ |
Graeme Russ | 8d61625 | 2012-11-27 15:38:36 +0000 | [diff] [blame] | 203 | movl $GENERATED_GBL_DATA_SIZE, %ecx |
| 204 | |
| 205 | /* Copy global data from CAR to SDRAM stack */ |
| 206 | call memcpy |
| 207 | |
| 208 | /* Reserve space for global descriptor table */ |
| 209 | subl $X86_GDT_SIZE, %esp |
| 210 | |
| 211 | /* Align global descriptor table to 16-byte boundary */ |
| 212 | andl $0xfffffff0, %esp |
| 213 | |
Simon Glass | da3a95d | 2015-07-31 09:31:25 -0600 | [diff] [blame] | 214 | /* Set second parameter to setup_gdt() */ |
Graeme Russ | 8d61625 | 2012-11-27 15:38:36 +0000 | [diff] [blame] | 215 | movl %esp, %edx |
| 216 | |
Graeme Russ | 8d61625 | 2012-11-27 15:38:36 +0000 | [diff] [blame] | 217 | /* Setup global descriptor table so gd->xyz works */ |
| 218 | call setup_gdt |
| 219 | |
Simon Glass | 801d70c | 2015-01-01 16:18:13 -0700 | [diff] [blame] | 220 | /* Set if we need to disable CAR */ |
| 221 | .weak car_uninit |
| 222 | movl $car_uninit, %eax |
| 223 | cmpl $0, %eax |
| 224 | jz 1f |
| 225 | |
| 226 | call car_uninit |
| 227 | 1: |
Simon Glass | da3a95d | 2015-07-31 09:31:25 -0600 | [diff] [blame] | 228 | /* Re-enter U-Boot by calling board_init_f_r() */ |
Graeme Russ | f48dd6f | 2012-01-01 15:06:39 +1100 | [diff] [blame] | 229 | call board_init_f_r |
Graeme Russ | fb00290 | 2011-02-12 15:11:58 +1100 | [diff] [blame] | 230 | |
Graeme Russ | 2f0e0cd | 2011-11-08 02:33:23 +0000 | [diff] [blame] | 231 | die: |
| 232 | hlt |
wdenk | 2262cfe | 2002-11-18 00:14:45 +0000 | [diff] [blame] | 233 | jmp die |
wdenk | 8bde7f7 | 2003-06-27 21:31:46 +0000 | [diff] [blame] | 234 | hlt |
Graeme Russ | 077e195 | 2010-04-24 00:05:42 +1000 | [diff] [blame] | 235 | |
| 236 | blank_idt_ptr: |
| 237 | .word 0 /* limit */ |
| 238 | .long 0 /* base */ |
Graeme Russ | a206cc2 | 2011-11-08 02:33:19 +0000 | [diff] [blame] | 239 | |
| 240 | .p2align 2 /* force 4-byte alignment */ |
| 241 | |
Simon Glass | da3a95d | 2015-07-31 09:31:25 -0600 | [diff] [blame] | 242 | /* Add a multiboot header so U-Boot can be loaded by GRUB2 */ |
Graeme Russ | a206cc2 | 2011-11-08 02:33:19 +0000 | [diff] [blame] | 243 | multiboot_header: |
| 244 | /* magic */ |
Simon Glass | da3a95d | 2015-07-31 09:31:25 -0600 | [diff] [blame] | 245 | .long 0x1badb002 |
Graeme Russ | a206cc2 | 2011-11-08 02:33:19 +0000 | [diff] [blame] | 246 | /* flags */ |
| 247 | .long (1 << 16) |
| 248 | /* checksum */ |
| 249 | .long -0x1BADB002 - (1 << 16) |
| 250 | /* header addr */ |
| 251 | .long multiboot_header - _x86boot_start + CONFIG_SYS_TEXT_BASE |
| 252 | /* load addr */ |
| 253 | .long CONFIG_SYS_TEXT_BASE |
| 254 | /* load end addr */ |
| 255 | .long 0 |
| 256 | /* bss end addr */ |
| 257 | .long 0 |
| 258 | /* entry addr */ |
| 259 | .long CONFIG_SYS_TEXT_BASE |