mirror of
https://github.com/edk2-porting/edk2-msm
synced 2024-11-22 18:36:19 +00:00
95 lines
1.5 KiB
ArmAsm
Executable File
95 lines
1.5 KiB
ArmAsm
Executable File
_Head:
|
|
/* Jump to the real code */
|
|
b _Start
|
|
|
|
_KernelStart:
|
|
/* Jump to the kernel
|
|
This value needs to be filled when patching */
|
|
b #0x02000000
|
|
|
|
/* Text Offset */
|
|
.quad 0x00080000
|
|
|
|
/* Image Size */
|
|
.quad 0x0BADFACE
|
|
|
|
/* Flags. 0x2 informs the bootloader to load kernel as
|
|
low as possible to make enough room for UEFI */
|
|
.quad 0x2
|
|
_StackBase:
|
|
.quad UEFI_BASE
|
|
|
|
_StackSize:
|
|
.quad UEFI_SIZE
|
|
|
|
_KernelSize:
|
|
/* Size of kernel for calculating where the FD is */
|
|
.quad 0xDEADBEEF
|
|
|
|
/* ARM64 Magic */
|
|
.ascii "ARM\x64"
|
|
|
|
/* Reserved */
|
|
.long 0
|
|
|
|
/* Magic for identification */
|
|
.ascii "EDK2-MSM"
|
|
|
|
_Start:
|
|
/* Here it reads 0x17FE00000 to get
|
|
message from simple-init on last reboot */
|
|
mov x4, #0x7FE00000
|
|
movk x4, #0x1, lsl #32
|
|
mov x6, #128
|
|
mov w7, #0x5241
|
|
|
|
_TestLoop:
|
|
ldrh w5, [x4]
|
|
add x4, x4, #2
|
|
cmp w5, w7
|
|
b.eq _ClearFlags
|
|
subs x6, x6, #1
|
|
b.ne _TestLoop
|
|
|
|
_CopyUEFI:
|
|
/* Copy the UEFI into the right location */
|
|
adr x4, _Head
|
|
ldr x5, _KernelSize
|
|
add x4, x4, x5
|
|
|
|
ldr x5, _StackBase
|
|
ldr x6, _StackSize
|
|
|
|
bl _CopyLoop
|
|
|
|
_Entry:
|
|
ldr x5, _StackBase
|
|
/* Jump to UEFI */
|
|
br x5
|
|
|
|
_CopyLoop:
|
|
ldp x2, x3, [x4], #16
|
|
stp x2, x3, [x5], #16
|
|
subs x6, x6, #16
|
|
b.ne _CopyLoop
|
|
ret
|
|
|
|
_ClearFlags:
|
|
mov x4, #0x7FE00000
|
|
movk x4, #0x1, lsl #32
|
|
mov x6, #32
|
|
|
|
_ClearLoop:
|
|
/* fill in 64bit at a time */
|
|
str xzr, [x4]
|
|
add x4, x4, #8
|
|
subs x6, x6, #1
|
|
b.ne _ClearLoop
|
|
b _KernelStart
|
|
|
|
_Dead:
|
|
/* We should never get here */
|
|
b _Dead
|
|
|
|
.text
|
|
.align 4
|