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kern: retrieve target firmware from exosphere instead of hardcoding

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Michael Scire 2020-07-14 19:52:41 -07:00 • committed by SciresM
parent 2ca6772475
commit 9beb05da50
4 changed files with 35 additions and 24 deletions
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21
mesosphere/kernel_ldr/source/arch/arm64/start.s
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@ -18,6 +18,10 @@
#define cpuactlr_el1 s3_1_c15_c2_0
#define cpuectlr_el1 s3_1_c15_c2_1
#define LOAD_IMMEDIATE_32(reg, val) \
mov reg, #(((val) >> 0x00) & 0xFFFF); \
movk reg, #(((val) >> 0x10) & 0xFFFF), lsl#16
.section .crt0.text.start, "ax", %progbits
.global _start
_start:
@ -46,12 +50,25 @@ _main:
ldr x17, [x17, #0x10] /* stack top */
add sp, x17, x18
/* Stack is now set up. */
/* Apply relocations and call init array for KernelLdr. */
/* Stack is now set up, so save important state. */
sub sp, sp, #0x30
stp x0, x1, [sp, #0x00]
stp x2, x30, [sp, #0x10]
stp xzr, xzr, [sp, #0x20]
/* Get the target firmware from exosphere. */
LOAD_IMMEDIATE_32(w0, 0xC3000004)
mov w1, #65000
smc #1
cmp x0, #0
0:
b.ne 0b
/* Store the target firmware. */
adr x0, __metadata_target_firmware
str w1, [x0]
/* Apply relocations and call init array for KernelLdr. */
adr x0, _start
adr x1, __external_references
ldr x1, [x1, #0x18] /* .dynamic. */