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feat(la64): use DMW kernel VA and place _start after image header #51

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feat(la64): use DMW kernel VA and place _start after image header #51

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8 changes: 4 additions & 4 deletions platforms/axplat-loongarch64-qemu-virt/axconfig.toml
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Original file line number Diff line number Diff line change
Expand Up @@ -25,19 +25,19 @@ phys-memory-size = 0x800_0000 # uint
phys-boot-offset = "0x9000_0000_0000_0000" # uint
# Linear mapping offset, for quick conversions between physical and virtual
# addresses.
phys-virt-offset = "0xffff_8000_0000_0000" # uint
phys-virt-offset = "0x9000_0000_0000_0000" # uint
# Offset of bus address and phys address. some boards, the bus address is
# different from the physical address.
phys-bus-offset = 0 # uint

# Base physical address of the kernel image.
kernel-base-paddr = 0x0020_0000 # uint
# Base virtual address of the kernel image.
kernel-base-vaddr = "0xffff_8000_0020_0000" # uint
kernel-base-vaddr = "0x9000_0000_0020_0000" # uint
# Kernel address space base.
kernel-aspace-base = "0xffff_8000_0000_0000" # uint
kernel-aspace-base = "0x9000_0000_0000_0000" # uint
# Kernel address space size.
kernel-aspace-size = "0x0000_7fff_ffff_f000" # uint
kernel-aspace-size = "0x0000_ffff_ffff_f000" # uint
# Stack size on bootstrapping. (256K)
boot-stack-size = 0x40000 # uint

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7 changes: 6 additions & 1 deletion platforms/axplat-loongarch64-qemu-virt/src/boot.rs
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Expand Up @@ -71,8 +71,10 @@ const BOOT_TO_VIRT: usize = PHYS_VIRT_OFFSET - PHYS_BOOT_OFFSET;
#[unsafe(naked)]
#[unsafe(no_mangle)]
#[unsafe(link_section = ".text.boot")]
unsafe extern "C" fn _start() -> ! {
unsafe extern "C" fn __boot_start() -> ! {
core::arch::naked_asm!("
.globl _linux_image_header
_linux_image_header:
.word 0x5a4d # MZ, MS-DOS header
.word 0 # Reserved
.dword 0x00200040 # Kernel entry point
Expand All @@ -84,6 +86,9 @@ unsafe extern "C" fn _start() -> ! {
.word 0x818223cd # Magic number
.word 0x0 # Offset to the PE header

.globl _start
_start:

# Setup DMW
li.d $t0, {phys_boot_offset} | 0x11
csrwr $t0, 0x180 # DMWIN0
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