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Code Issues Releases Activity

Exosphere: Copy initial data image to DRAM for coldboot init.

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This commit is contained in:
Michael Scire 2018-05-18 06:49:49 -06:00
parent 1a9f095463
commit ea905725c4
2 changed files with 26 additions and 7 deletions
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2
exosphere/src/coldboot_init.c
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@ -122,7 +122,7 @@ uintptr_t get_coldboot_crt0_stack_address(void) {
void coldboot_init(coldboot_crt0_reloc_list_t *reloc_list, uintptr_t start_cold) { void coldboot_init(coldboot_crt0_reloc_list_t *reloc_list, uintptr_t start_cold) {
//MAILBOX_NX_SECMON_BOOT_TIME = TIMERUS_CNTR_1US_0; //MAILBOX_NX_SECMON_BOOT_TIME = TIMERUS_CNTR_1US_0;
//MAKE_REG32(0x7000E400ULL) = 0x10; MAKE_REG32(0x7000E400ULL) = 0x10;
/* Custom approach */ /* Custom approach */
reloc_list->reloc_base = start_cold; reloc_list->reloc_base = start_cold;

31
exosphere/src/start.s
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@ -93,9 +93,10 @@ __start_cold:
stp x3, x4, [x0], #0x10 stp x3, x4, [x0], #0x10
cmp x0, x2 cmp x0, x2
blo 1b blo 1b
adr x20, __start_cold adr x19, __start_cold
adr x19, g_coldboot_crt0_relocation_list adr x20, g_coldboot_crt0_relocation_list
sub x20, x20, x19
ldr x16, =_post_cold_crt0_reloc ldr x16, =_post_cold_crt0_reloc
br x16 br x16
@ -105,10 +106,28 @@ _post_cold_crt0_reloc:
bl get_coldboot_crt0_stack_address bl get_coldboot_crt0_stack_address
mov sp, x0 mov sp, x0
mov fp, #0 mov fp, #0
/* Relocate Exosphere image to free DRAM, clearing the image in IRAM. */
ldr x0, =0x80010000
add x20, x20, x0
ldr x2, =__loaded_end_lma__
ldr x3, =0x40020000
sub x21, x2, x3
mov x1, x19
mov x2, x21
add x2, x2, x0
2:
ldp x3, x4, [x1]
stp x3, x4, [x0], #0x10
stp xzr, xzr, [x1], #0x10
cmp x0, x2
blo 2b
/* X1 is already set to __start_cold (original load location) from above. */ /* X0 = TZ-in-DRAM, X1 = relocation-list-in-DRAM. */
mov x0, x19 ldr x0, =0x80010000
mov x1, x20 mov x1, x20
/* Set size in coldboot relocation list. */
str x21, [x1, #0x8]
bl coldboot_init bl coldboot_init
ldr x16, =__jump_to_main_cold ldr x16, =__jump_to_main_cold
@ -240,7 +259,7 @@ __jump_to_lower_el:
.align 3 .align 3
.global g_coldboot_crt0_relocation_list .global g_coldboot_crt0_relocation_list
g_coldboot_crt0_relocation_list: g_coldboot_crt0_relocation_list:
.quad 0, __loaded_end_lma__ /* __start_cold, to be set & loaded size */ .quad 0, 0 /* __start_cold, to be set & loaded size */
.quad 1, 5 /* number of sections to relocate/clear before & after mmu init */ .quad 1, 5 /* number of sections to relocate/clear before & after mmu init */
/* Relocations */ /* Relocations */
.quad __warmboot_crt0_start__, __warmboot_crt0_end__, __warmboot_crt0_lma__ .quad __warmboot_crt0_start__, __warmboot_crt0_end__, __warmboot_crt0_lma__