2 BootMii - a Free Software replacement for the Nintendo/BroadOn bootloader.
5 Copyright (C) 2008 Segher Boessenkool <segher@kernel.crashing.org>
7 # This code is licensed to you under the terms of the GNU GPL, version 2;
8 # see file COPYING or http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt
11 #include "bootmii_ppc.h"
16 extern char exception_2200_start, exception_2200_end;
18 void exception_handler(int exception)
20 // check if the exception was actually an interrupt
21 if (exception == 0x500) {
24 _CPU_ISR_Disable(cookie);
25 printf("\nInterrupt occured ;-) Which one? -> ");
26 u32 enabled = read32(BW_PI_IRQMASK);
27 u32 flags = read32(BW_PI_IRQFLAG);
28 flags = flags & enabled;
29 if (flags & (1<<1)) { // RESET
30 write32(BW_PI_IRQFLAG, 1<<1);
33 if (flags & (1<<14)) { // Hollywood-PIC IRQ
34 write32(BW_PI_IRQFLAG, 1<<14);
35 write32(HW_PPCIRQFLAG, ~0); // dirty
36 printf("Hollywood-PIC :)\n");
38 _CPU_ISR_Restore(cookie);
46 printf("\nException %04x occurred!\n", exception);
48 x = (u32 *)0x80002000;
50 printf("\n R0..R7 R8..R15 R16..R23 R24..R31\n");
51 for (i = 0; i < 8; i++) {
52 printf("%08x %08x %08x %08x\n", x[0], x[8], x[16], x[24]);
55 x = (u32 *)0x80002080;
57 printf("\n CR/XER LR/CTR SRR0/SRR1 DAR/DSISR\n");
58 for (i = 0; i < 2; i++) {
59 printf("%08x %08x %08x %08x\n", x[0], x[2], x[4], x[6]);
68 void exception_init(void)
73 for (vector = 0x100; vector < 0x2000; vector += 0x10) {
74 u32 *insn = (u32 *)(0x80000000 + vector);
76 insn[0] = 0xbc002000; // stmw 0,0x2000(0)
77 insn[1] = 0x38600000 | (u32)vector; // li 3,vector
78 insn[2] = 0x48002202; // ba 0x2200
81 sync_before_exec((void *)0x80000100, 0x1f00);
83 len_2200 = &exception_2200_end - &exception_2200_start;
84 memcpy((void *)0x80002200, &exception_2200_start, len_2200);
85 sync_before_exec((void *)0x80002200, len_2200);