diff options
Diffstat (limited to 'src/arch/riscv/bootblock.S')
| -rw-r--r-- | src/arch/riscv/bootblock.S | 33 |
1 files changed, 18 insertions, 15 deletions
diff --git a/src/arch/riscv/bootblock.S b/src/arch/riscv/bootblock.S index 4f2d1ecd55..a26b144458 100644 --- a/src/arch/riscv/bootblock.S +++ b/src/arch/riscv/bootblock.S @@ -22,30 +22,33 @@ .section ".text._start", "ax", %progbits // Maybe there's a better way. -.space 0x2000 +.space 0x200 .globl _start _start: // pending figuring out this f-ing toolchain. Hardcode what we know works. - la sp, 0x4ef0 // .stacktop -// la a0, trap_entry +// la sp, 0x4ef0 // .stacktop +// la sp, 0x40000 // from src/mainboard/emulation/qemu-riscv + la sp, 0x7FF00 // stack start + stack size + + // make room for HLS + addi sp, sp, -64 // MENTRY_FRAME_SIZE + + + //poison the stack + la t1, 0x40000 + li t0, 0xdeadbeef + sd t0, 0(t1) + // la gp, _gp -// csrw evec, a0 # clear any pending interrupts +#if __GNUC__ < 5 csrwi clear_ipi, 0 +#else + csrwi sip, 0 +#endif - li a0, SR_S | SR_PS | SR_EI | SR_S64 | SR_U64 - or a1, a0, SR_EF | SR_EA - csrw status, a1 - csrr a1, status - csrw status, a0 - -// and a2, a1, SR_EF -// sw a2, have_fp, t0 - -// and a2, a1, SR_EA -// sw a2, have_accelerator, t0 call main .=0x4000 .stack: |