| 26,6 → 26,7 |
|---|
| # THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| # |
| |
| #include "asm.h" |
| #include "regname.h" |
| |
| .data |
| 35,198 → 36,106 |
|---|
| |
| .text |
| |
| .global memsetb |
| .global memcpy |
| .global flush_instruction_cache |
| .global halt |
| .global jump_to_kernel |
| |
| memsetb: |
| rlwimi r5, r5, 8, 16, 23 |
| rlwimi r5, r5, 16, 0, 15 |
| |
| addi r14, r3, -4 |
| |
| cmplwi 0, r4, 4 |
| blt 7f |
| |
| stwu r5, 4(r14) |
| beqlr |
| |
| andi. r15, r14, 3 |
| add r4, r15, r4 |
| subf r14, r15, r14 |
| srwi r15, r4, 2 |
| mtctr r15 |
| |
| bdz 6f |
| |
| 1: |
| stwu r5, 4(r14) |
| bdnz 1b |
| |
| 6: |
| |
| andi. r4, r4, 3 |
| |
| 7: |
| |
| cmpwi 0, r4, 0 |
| beqlr |
| |
| mtctr r4 |
| addi r6, r6, 3 |
| |
| 8: |
| |
| stbu r5, 1(r14) |
| bdnz 8b |
| |
| blr |
| halt: |
| b halt |
| |
| memcpy: |
| srwi. r7, r5, 3 |
| addi r6, r3, -4 |
| addi r4, r4, -4 |
| beq 2f |
| |
| andi. r0, r6, 3 |
| mtctr r7 |
| bne 5f |
| |
| 1: |
| |
| lwz r7, 4(r4) |
| lwzu r8, 8(r4) |
| stw r7, 4(r6) |
| stwu r8, 8(r6) |
| bdnz 1b |
| |
| andi. r5, r5, 7 |
| |
| 2: |
| |
| cmplwi 0, r5, 4 |
| blt 3f |
| |
| lwzu r0, 4(r4) |
| addi r5, r5, -4 |
| stwu r0, 4(r6) |
| |
| 3: |
| |
| cmpwi 0, r5, 0 |
| beqlr |
| mtctr r5 |
| addi r4, r4, 3 |
| addi r6, r6, 3 |
| |
| 4: |
| |
| lbzu r0, 1(r4) |
| stbu r0, 1(r6) |
| bdnz 4b |
| blr |
| |
| 5: |
| |
| subfic r0, r0, 4 |
| mtctr r0 |
| |
| 6: |
| |
| lbz r7, 4(r4) |
| addi r4, r4, 1 |
| stb r7, 4(r6) |
| addi r6, r6, 1 |
| bdnz 6b |
| subf r5, r0, r5 |
| rlwinm. r7, r5, 32-3, 3, 31 |
| beq 2b |
| mtctr r7 |
| b 1b |
| |
| flush_instruction_cache: |
| |
| # Flush data cache |
| |
| lis r3, flush_buffer@h |
| ori r3, r3, flush_buffer@l |
| li r4, L1_CACHE_LINES |
| mtctr r4 |
| |
| 0: |
| |
| lwz r4, 0(r3) |
| addi r3, r3, L1_CACHE_BYTES |
| bdnz 0b |
| |
| # Invalidate instruction cache |
| |
| li r3, 0 |
| ori r3, r3, (hid0_ice | hid0_dce | hid0_icfi | hid0_dci) |
| mfspr r4, hid0 |
| or r5, r4, r3 |
| isync |
| mtspr hid0, r5 |
| sync |
| isync |
| |
| # Enable instruction cache |
| |
| ori r5, r4, hid0_ice |
| mtspr hid0, r5 |
| sync |
| isync |
| blr |
| |
| jump_to_kernel: |
| |
| # r3 = kernel_start (va) |
| # r4 = memmap (pa) |
| # r5 = real_mode (pa) |
| # r3 = memmap (pa) |
| # r4 = trans (pa) |
| # r5 = number of kernel pages |
| # r6 = real_mode (pa) |
| |
| mtspr srr0, r5 |
| mtspr srr0, r6 |
| |
| # jumps to real_mode |
| |
| mfmsr r5 |
| lis r6, ~0@h |
| ori r6, r6, ~(msr_ir | msr_dr)@l |
| and r5, r5, r6 |
| mtspr srr1, r5 |
| mfmsr r31 |
| lis r30, ~0@h |
| ori r30, r30, ~(msr_ir | msr_dr)@l |
| and r31, r31, r30 |
| mtspr srr1, r31 |
| rfi |
| |
| .section REALMODE |
| .align 12 |
| .align PAGE_WIDTH |
| .global real_mode |
| |
| real_mode: |
| |
| |
| # copy kernel to proper location |
| # |
| # r4 = trans (pa) |
| # r5 = number of kernel pages |
| |
| li r31, PAGE_SIZE >> 3 |
| li r30, 0 |
| |
| page_copy: |
| |
| cmpwi r5, 0 |
| beq copy_end |
| |
| # copy single page |
| |
| mtctr r31 |
| lwz r29, 0(r4) |
| |
| copy_loop: |
| |
| lwz r28, 0(r29) |
| stw r28, 0(r30) |
| |
| addi r29, r29, 4 |
| addi r30, r30, 4 |
| |
| bdnz copy_loop |
| |
| subi r5, r5, 1 |
| addi r4, r4, 4 |
| b page_copy |
| |
| copy_end: |
| |
| # fill segment registers |
| |
| li r5, 16 |
| mtctr r5 |
| li r5, 0 |
| li r6, 0 |
| li r31, 16 |
| mtctr r31 |
| li r31, 0 |
| li r30, 0x2000 |
| |
| seg_fill: |
| |
| mtsrin r6, r5 |
| addis r5, r5, 0x1000 # move to next SR |
| addis r6, r6, 0x10 # add 256 MB, move to next SR |
| mtsrin r30, r31 |
| |
| addis r31, r31, 0x1000 # add 256 MB |
| addi r30, r30, 0x111 # move to next SR |
| |
| bdnz seg_fill |
| |
| # bootstrap kernel |
| # create identity mapping |
| |
| tlbia |
| |
| # start the kernel |
| # |
| # r3 = kernel_start (va) |
| # r4 = memmap (pa) -> r10 |
| # r3 = memmap (pa) |
| |
| mtspr srr0, r3 |
| lis r31, KERNEL_START_ADDR@ha |
| addi r31, r31, KERNEL_START_ADDR@l |
| |
| mfmsr r5 |
| ori r5, r5, (msr_ir | msr_dr)@l |
| mtspr srr1, r5 |
| mtspr srr0, r31 |
| |
| mr r10, r4 |
| mfmsr r31 |
| ori r31, r31, (msr_ir | msr_dr)@l |
| mtspr srr1, r31 |
| |
| rfi |
| |
| .align PAGE_WIDTH |
| .global trans |
| trans: |
| .space (TRANS_SIZE * TRANS_ITEM_SIZE) |