diff options
Diffstat (limited to 'c/src/lib/libbsp/powerpc/shared/bootloader/qemu_fakerom.S')
| -rw-r--r-- | c/src/lib/libbsp/powerpc/shared/bootloader/qemu_fakerom.S | 217 |
1 files changed, 0 insertions, 217 deletions
diff --git a/c/src/lib/libbsp/powerpc/shared/bootloader/qemu_fakerom.S b/c/src/lib/libbsp/powerpc/shared/bootloader/qemu_fakerom.S deleted file mode 100644 index b77c3bd138..0000000000 --- a/c/src/lib/libbsp/powerpc/shared/bootloader/qemu_fakerom.S +++ /dev/null @@ -1,217 +0,0 @@ -/* A fake 'bios' which does nothing but move a kernel image - * to RAM address zero and then starts that... - */ - -#include <bsp/residual.h> - -#define LD_CACHE_LINE_SIZE 5 -#define INIT_STACK (0x100 - 16) /* 16-byte/svr4 aligned */ - -/* These offsets must correspond to declaration in qemu_fakeres.c */ -#define DAT_LEN 0 -#define RES_OFF 4 -#define CMD_OFF 8 -#define CMD_LEN 12 -#define IMG_ADR 16 - -/* Non-volatile registers */ -#define OBASE 30 -#define PCID 25 -#define PCIA 26 - -#define PCI_MAX_DEV 32 - -#define BA_OPCODE(tgt) ((18<<(31-5)) | 2 | ((tgt) & 0x03fffffc)) - - .global fake_data - .global res_set_memsz - - .global _start -_start: - lis 1, INIT_STACK@h - ori 1,1,INIT_STACK@l - - /* qemu 0.14.1 has the wrong exception prefix for 74xx CPUs - * (bug 811683). Work around this by putting a stub at 0x00000X00 - * which simply jumps to high memory. We only need the SC exception - * for now. - */ - lis 3, BA_OPCODE(0xfff00000)@h - ori 3, 3, BA_OPCODE(0xfff00000)@l - li 4, 0x0c00 - add 3, 3, 4 - stw 3, 0(4) - dcbf 0, 4 - icbi 0, 4 - - bl pci_irq_set - /* copy residual to RAM and fix up; - * this routine returns a pointer to - * a 'fake_data' struct. If reading - * NVRAM failed then the return value - * points to a fall-back version in - * ROM... - */ - bl res_copy - /* fake_data pointer to R29 */ - mr 29, 3 - - /* Load up R3..R5 with PreP mandated - * values (R3: residual, R4: kernel image, - * R5: OpenFirmware PTR (or NULL). - */ - - /* load R3 with residual pointer */ - lwz 3, RES_OFF(29) - add 3, 3, 29 - - /* load R4 with image address */ - lwz 4, IMG_ADR(29) - - /* load R5 with zero (OFW = NULL) */ - li 5, 0 - /* EXTENSION: R6 = cmdline start */ - lwz 6, CMD_OFF(29) - add 6, 6, 29 - /* EXTENSION: R7 = cmdline end */ - lwz 7, CMD_LEN(29) - add 7, 7, 6 - - /* jump to image address */ - mtctr 4 - bctr - - .org 0x100 - b _start - - .org 0x110 -template: - mfsrr0 30 - mfsrr1 31 -1: b 1b -template_end: - - .org 0xc00 - b monitor - - - .org 0x4000 -codemove: /* src/dst are cache-aligned */ - addi 5,5,(1<<LD_CACHE_LINE_SIZE)-1 - srwi 5,5,LD_CACHE_LINE_SIZE - addi 3,3,-4 - addi 4,4,-4 -1: - li 0, (1<<LD_CACHE_LINE_SIZE) - mtctr 0 -2: - lwzu 0, 4(3) - stwu 0, 4(4) - bdnz 2b - dcbf 0,4 - icbi 0,4 - addic. 5,5,-1 - bne 1b - blr - -cpexc: - lis 3,template@h - ori 3,3,template@l - li 5,template_end-template - b codemove - -monitor: - stwu 1,-16(1) - stw OBASE, 8(1) - lis OBASE, 0x80000000@h - cmplwi 10,0x63 /* enter_monitor -> RESET */ - bne 10f -hwreset: - li 3,1 - stb 3,0x92(OBASE) -1: b 1b -10: cmplwi 10,0x1d /* .NETCTRL -> ignore */ - bne 10f - b ret_from_mon -10: b hwreset /* unknown -> RESET */ - -ret_from_mon: - lwz OBASE,8(1) - lwz 1,0(1) - rfi - -rcb: - stwbrx 3, 0, PCIA - lbzx 3, 0, PCID - blr - -wcb: - stwbrx 3, 0, PCIA - stbx 4, 0, PCID - blr - -rcd: - stwbrx 3, 0, PCIA - lwbrx 3, 0, PCID - blr - -/* fixup pci interrupt line register according to what - * qemu does: line = ((pin-1) + slot_no) & 1 ? 11 : 9; - */ -pci_irq_set: - /* set up stack frame */ - stwu 1, -32(1) - mflr 0 - stw 0, 32+4(1) - /* load counter with # of PCI devs */ - li 0, PCI_MAX_DEV - mtctr 0 - /* save non-volatile registers we use - * in stack frame - */ - stw 20, 8(1) - stw PCIA, 12(1) - stw PCID, 16(1) - /* load non-volatile registers with - * intended values. - */ - lis 20, 0x80000000@h /* key for slot # 0 */ - lis PCIA, 0x80000cf8@h /* PCI config space address reg */ - ori PCIA, PCIA, 0x80000cf8@l - addi PCID, PCIA, 4 /* PCI config space data reg */ - - /* loop over all slots and fix up PCI IRQ LINE */ -1: - mr 3, 20 - bl rcd - addi 3, 3, 1 - cmplwi 3, 0 /* slot empty (= -1 + 1 = 0) ? */ - beq 2f - addi 3, 20, 0x3d - bl rcb - cmplwi 3, 0 - beq 2f - slwi 4, 3, 11 - addi 3, 20, 0x3c - xor 4, 4, 3 /* bit 11 = slot # + irq_num [zero-based] + 1 */ - andi. 4, 4, 0x0800 - li 4, 11 - beq 3f - li 4, 9 -3: - bl wcb -2: - addi 20, 20, 0x0800 /* next slot */ - bdnz 1b - - /* restore and return */ - lwz 20, 32+4(1) - mtlr 20 - lwz PCID, 16(1) - lwz PCIA, 12(1) - lwz 20, 8(1) - lwz 1, 0(1) - blr - - .section .romentry, "ax" - b _start |