diff options
Diffstat (limited to 'roms/openbios/arch/sparc64/vectors.S')
| -rw-r--r-- | roms/openbios/arch/sparc64/vectors.S | 783 |
1 files changed, 783 insertions, 0 deletions
diff --git a/roms/openbios/arch/sparc64/vectors.S b/roms/openbios/arch/sparc64/vectors.S new file mode 100644 index 000000000..b66f0d2a8 --- /dev/null +++ b/roms/openbios/arch/sparc64/vectors.S @@ -0,0 +1,783 @@ +/* + * <vectors.S> + * + * Sparc V9 Trap Table(s) with SpitFire/Cheetah extensions. + * + * Copyright (C) 1996, 2001 David S. Miller (davem@caip.rutgers.edu) + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * version 2 as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, + * MA 02110-1301, USA. + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License V2 + * as published by the Free Software Foundation + */ + +#define __ASSEMBLY__ +#include "cpustate.h" +#include "pstate.h" +#include <asm/asi.h> +#define ASI_BP ASI_PHYS_BYPASS_EC_E +#define PROM_ADDR 0x1fff0000000 +#define SER_ADDR 0x1fe020003f8 +#define TICK_INT_DIS 0x8000000000000000 +#define TICK_INTERVAL 1*1000*1000 + + .section ".text.vectors", "ax" + .align 16384 +/* Sparc64 trap table */ + .globl trap_table, __divide_error, softint_irq, softint_irq_tl1 + .register %g2, #scratch + .register %g3, #scratch + .register %g6, #scratch + .register %g7, #scratch +trap_table: +#define SPILL_WINDOW \ + btst 1, %sp; \ + be spill_32bit; \ + nop; \ + stx %l0, [%sp + STACK_BIAS + 0x00]; \ + stx %l1, [%sp + STACK_BIAS + 0x08]; \ + stx %l2, [%sp + STACK_BIAS + 0x10]; \ + stx %l3, [%sp + STACK_BIAS + 0x18]; \ + stx %l4, [%sp + STACK_BIAS + 0x20]; \ + stx %l5, [%sp + STACK_BIAS + 0x28]; \ + stx %l6, [%sp + STACK_BIAS + 0x30]; \ + stx %l7, [%sp + STACK_BIAS + 0x38]; \ + stx %i0, [%sp + STACK_BIAS + 0x40]; \ + stx %i1, [%sp + STACK_BIAS + 0x48]; \ + stx %i2, [%sp + STACK_BIAS + 0x50]; \ + stx %i3, [%sp + STACK_BIAS + 0x58]; \ + stx %i4, [%sp + STACK_BIAS + 0x60]; \ + stx %i5, [%sp + STACK_BIAS + 0x68]; \ + stx %i6, [%sp + STACK_BIAS + 0x70]; \ + stx %i7, [%sp + STACK_BIAS + 0x78]; \ + saved; retry; nop; nop; nop; nop; nop; nop; \ + nop; nop; nop; nop; nop; + +#define FILL_WINDOW \ + btst 1, %sp; \ + be fill_32bit; \ + nop; \ + ldx [%sp + STACK_BIAS + 0x00], %l0; \ + ldx [%sp + STACK_BIAS + 0x08], %l1; \ + ldx [%sp + STACK_BIAS + 0x10], %l2; \ + ldx [%sp + STACK_BIAS + 0x18], %l3; \ + ldx [%sp + STACK_BIAS + 0x20], %l4; \ + ldx [%sp + STACK_BIAS + 0x28], %l5; \ + ldx [%sp + STACK_BIAS + 0x30], %l6; \ + ldx [%sp + STACK_BIAS + 0x38], %l7; \ + ldx [%sp + STACK_BIAS + 0x40], %i0; \ + ldx [%sp + STACK_BIAS + 0x48], %i1; \ + ldx [%sp + STACK_BIAS + 0x50], %i2; \ + ldx [%sp + STACK_BIAS + 0x58], %i3; \ + ldx [%sp + STACK_BIAS + 0x60], %i4; \ + ldx [%sp + STACK_BIAS + 0x68], %i5; \ + ldx [%sp + STACK_BIAS + 0x70], %i6; \ + ldx [%sp + STACK_BIAS + 0x78], %i7; \ + restored; retry; nop; nop; nop; nop; nop; nop; \ + nop; nop; nop; nop; nop; + +#define CLEAN_WINDOW \ + rdpr %cleanwin, %l0; add %l0, 1, %l0; \ + wrpr %l0, 0x0, %cleanwin; \ + clr %o0; clr %o1; clr %o2; clr %o3; \ + clr %o4; clr %o5; clr %o6; clr %o7; \ + clr %l0; clr %l1; clr %l2; clr %l3; \ + clr %l4; clr %l5; clr %l6; clr %l7; \ + retry; \ + nop;nop;nop;nop;nop;nop;nop;nop;nop;nop;nop;nop; + +#define TRAP_IRQ(routine, level) \ + ba routine; mov level, %g1; nop; nop; nop; nop; nop; nop; +#define BTRAP(lvl) \ + ba bug; mov lvl, %g1; nop; nop; nop; nop; nop; nop; +#define BTRAPTL1(lvl) BTRAP(lvl) +#define BTRAPS(x) BTRAP(x) BTRAP(x+1) BTRAP(x+2) BTRAP(x+3) BTRAP(x+4) BTRAP(x+5) BTRAP(x+6) BTRAP(x+7) +#define BTRAPS4(x) BTRAP(x) BTRAP(x+1) BTRAP(x+2) BTRAP(x+3) +#define TRAP_HANDLER(routine) ba routine; nop; nop; nop; nop; nop; nop; nop; + +#define STACK_BIAS 2047 + .globl sparc64_ttable_tl0, sparc64_ttable_tl1 +sparc64_ttable_tl0: + ba entry; nop; nop; nop; nop; nop; nop; nop;! XXX remove + ba entry; nop; nop; nop; nop; nop; nop; nop;! Power-on reset + ba entry; nop; nop; nop; nop; nop; nop; nop;! Watchdog reset + ba entry; nop; nop; nop; nop; nop; nop; nop;! External reset + ba entry; nop; nop; nop; nop; nop; nop; nop;! Software reset + ba entry; nop; nop; nop; nop; nop; nop; nop;! RED state + BTRAP(0x06) BTRAP(0x07) BTRAPS(0x08) + BTRAPS(0x10) BTRAPS(0x18) + BTRAP(0x20) BTRAP(0x21) BTRAP(0x22) BTRAP(0x23) + CLEAN_WINDOW ! 24-27 + BTRAPS(0x28) + BTRAPS(0x30) BTRAPS(0x38) + BTRAP(0x40) BTRAP(0x41) BTRAP(0x42) BTRAP(0x43) +tl0_irq4: TRAP_IRQ(handler_irq, 4) +tl0_irq5: TRAP_IRQ(handler_irq, 5) TRAP_IRQ(handler_irq, 6) +tl0_irq7: TRAP_IRQ(handler_irq, 7) TRAP_IRQ(handler_irq, 8) +tl0_irq9: TRAP_IRQ(handler_irq, 9) TRAP_IRQ(handler_irq, 10) +tl0_irq11: TRAP_IRQ(handler_irq, 11) TRAP_IRQ(handler_irq, 12) +tl0_irq13: TRAP_IRQ(handler_irq, 13) +tl0_irq14: TRAP_IRQ(softint_irq, 14) +tl0_irq15: TRAP_IRQ(handler_irq, 15) + BTRAPS(0x50) BTRAPS(0x58) + BTRAPS4(0x60) + TRAP_HANDLER(reload_IMMU_tlb) ! 0x64 : instruction_access_MMU_miss + TRAP_HANDLER(reload_IMMU_tlb) ! 0x65 : instruction_access_MMU_miss + TRAP_HANDLER(reload_IMMU_tlb) ! 0x66 : instruction_access_MMU_miss + TRAP_HANDLER(reload_IMMU_tlb) ! 0x67 : instruction_access_MMU_miss + TRAP_HANDLER(reload_DMMU_tlb) ! 0x68 : data_access_MMU_miss + TRAP_HANDLER(reload_DMMU_tlb) ! 0x69 : data_access_MMU_miss + TRAP_HANDLER(reload_DMMU_tlb) ! 0x6A : data_access_MMU_miss + TRAP_HANDLER(reload_DMMU_tlb) ! 0x6B : data_access_MMU_miss + BTRAPS4(0x6C) ! data_access_protection + BTRAPS(0x70) BTRAPS(0x78) +tl0_s0n: SPILL_WINDOW +tl0_s1n: SPILL_WINDOW +tl0_s2n: SPILL_WINDOW +tl0_s3n: SPILL_WINDOW +tl0_s4n: SPILL_WINDOW +tl0_s5n: SPILL_WINDOW +tl0_s6n: SPILL_WINDOW +tl0_s7n: SPILL_WINDOW +tl0_s0o: SPILL_WINDOW +tl0_s1o: SPILL_WINDOW +tl0_s2o: SPILL_WINDOW +tl0_s3o: SPILL_WINDOW +tl0_s4o: SPILL_WINDOW +tl0_s5o: SPILL_WINDOW +tl0_s6o: SPILL_WINDOW +tl0_s7o: SPILL_WINDOW +tl0_f0n: FILL_WINDOW +tl0_f1n: FILL_WINDOW +tl0_f2n: FILL_WINDOW +tl0_f3n: FILL_WINDOW +tl0_f4n: FILL_WINDOW +tl0_f5n: FILL_WINDOW +tl0_f6n: FILL_WINDOW +tl0_f7n: FILL_WINDOW +tl0_f0o: FILL_WINDOW +tl0_f1o: FILL_WINDOW +tl0_f2o: FILL_WINDOW +tl0_f3o: FILL_WINDOW +tl0_f4o: FILL_WINDOW +tl0_f5o: FILL_WINDOW +tl0_f6o: FILL_WINDOW +tl0_f7o: FILL_WINDOW +tl0_resv100: BTRAPS(0x100) BTRAPS(0x108) +tl0_resv110: BTRAPS(0x110) BTRAPS(0x118) +tl0_resv120: BTRAPS(0x120) BTRAPS(0x128) +tl0_resv130: BTRAPS(0x130) BTRAPS(0x138) +tl0_resv140: BTRAPS(0x140) BTRAPS(0x148) +tl0_resv150: BTRAPS(0x150) BTRAPS(0x158) +tl0_resv160: BTRAPS(0x160) BTRAPS(0x168) +tl0_resv170: BTRAPS(0x170) BTRAPS4(0x178) + BTRAP(0x17c) + TRAP_HANDLER(prom_debug) ! 0x17d : debugger + TRAP_HANDLER(prom_debug) ! 0x17e : debugger breakpoint + BTRAP(0x17f) +tl0_resv180: BTRAPS(0x180) BTRAPS(0x188) +tl0_resv190: BTRAPS(0x190) BTRAPS(0x198) +tl0_resv1a0: BTRAPS(0x1a0) BTRAPS(0x1a8) +tl0_resv1b0: BTRAPS(0x1b0) BTRAPS(0x1b8) +tl0_resv1c0: BTRAPS(0x1c0) BTRAPS(0x1c8) +tl0_resv1d0: BTRAPS(0x1d0) BTRAPS(0x1d8) +tl0_resv1e0: BTRAPS(0x1e0) BTRAPS(0x1e8) +tl0_resv1f0: BTRAPS(0x1f0) BTRAPS(0x1f8) + +#undef BTRAPS +#define BTRAPS(x) BTRAPTL1(x) BTRAPTL1(x+1) BTRAPTL1(x+2) BTRAPTL1(x+3) BTRAPTL1(x+4) BTRAPTL1(x+5) BTRAPTL1(x+6) BTRAPTL1(x+7) + +#define SKIP_IRQ(routine, level) \ + retry; nop; nop; nop; nop; nop; nop; nop; + +sparc64_ttable_tl1: + BTRAPS(0x00) BTRAPS(0x08) + BTRAPS(0x10) BTRAPS(0x18) + BTRAPTL1(0x20) BTRAPTL1(0x21) BTRAPTL1(0x22) BTRAPTL1(0x23) + CLEAN_WINDOW ! 24-27 + BTRAPS(0x28) + BTRAPS(0x30) BTRAPS(0x38) + BTRAPTL1(0x40) BTRAPTL1(0x41) BTRAPTL1(0x42) BTRAPTL1(0x43) +tl1_irq4: TRAP_IRQ(handler_irq, 4) +tl1_irq5: TRAP_IRQ(handler_irq, 5) TRAP_IRQ(handler_irq, 6) +tl1_irq7: TRAP_IRQ(handler_irq, 7) TRAP_IRQ(handler_irq, 8) +tl1_irq9: TRAP_IRQ(handler_irq, 9) TRAP_IRQ(handler_irq, 10) +tl1_irq11: TRAP_IRQ(handler_irq, 11) TRAP_IRQ(handler_irq, 12) +tl1_irq13: TRAP_IRQ(handler_irq, 13) +tl1_irq14: SKIP_IRQ(softint_irq, 14) +tl1_irq15: TRAP_IRQ(handler_irq, 15) + BTRAPS(0x50) BTRAPS(0x58) + BTRAPS4(0x60) + TRAP_HANDLER(reload_IMMU_tlb) ! 0x64 : instruction_access_MMU_miss + TRAP_HANDLER(reload_IMMU_tlb) ! 0x65 : instruction_access_MMU_miss + TRAP_HANDLER(reload_IMMU_tlb) ! 0x66 : instruction_access_MMU_miss + TRAP_HANDLER(reload_IMMU_tlb) ! 0x67 : instruction_access_MMU_miss + TRAP_HANDLER(reload_DMMU_tlb) ! 0x68 : data_access_MMU_miss + TRAP_HANDLER(reload_DMMU_tlb) ! 0x69 : data_access_MMU_miss + TRAP_HANDLER(reload_DMMU_tlb) ! 0x6A : data_access_MMU_miss + TRAP_HANDLER(reload_DMMU_tlb) ! 0x6B : data_access_MMU_miss + BTRAPS4(0x6C) ! data_access_protection + BTRAPS(0x70) BTRAPS(0x78) +tl1_s0n: SPILL_WINDOW +tl1_s1n: SPILL_WINDOW +tl1_s2n: SPILL_WINDOW +tl1_s3n: SPILL_WINDOW +tl1_s4n: SPILL_WINDOW +tl1_s5n: SPILL_WINDOW +tl1_s6n: SPILL_WINDOW +tl1_s7n: SPILL_WINDOW +tl1_s0o: SPILL_WINDOW +tl1_s1o: SPILL_WINDOW +tl1_s2o: SPILL_WINDOW +tl1_s3o: SPILL_WINDOW +tl1_s4o: SPILL_WINDOW +tl1_s5o: SPILL_WINDOW +tl1_s6o: SPILL_WINDOW +tl1_s7o: SPILL_WINDOW +tl1_f0n: FILL_WINDOW +tl1_f1n: FILL_WINDOW +tl1_f2n: FILL_WINDOW +tl1_f3n: FILL_WINDOW +tl1_f4n: FILL_WINDOW +tl1_f5n: FILL_WINDOW +tl1_f6n: FILL_WINDOW +tl1_f7n: FILL_WINDOW +tl1_f0o: FILL_WINDOW +tl1_f1o: FILL_WINDOW +tl1_f2o: FILL_WINDOW +tl1_f3o: FILL_WINDOW +tl1_f4o: FILL_WINDOW +tl1_f5o: FILL_WINDOW +tl1_f6o: FILL_WINDOW +tl1_f7o: FILL_WINDOW +tl1_resv100: BTRAPS(0x100) BTRAPS(0x108) +tl1_resv110: BTRAPS(0x110) BTRAPS(0x118) +tl1_resv120: BTRAPS(0x120) BTRAPS(0x128) +tl1_resv130: BTRAPS(0x130) BTRAPS(0x138) +tl1_resv140: BTRAPS(0x140) BTRAPS(0x148) +tl1_resv150: BTRAPS(0x150) BTRAPS(0x158) +tl1_resv160: BTRAPS(0x160) BTRAPS(0x168) +tl1_resv170: BTRAPS(0x170) BTRAPS4(0x178) + BTRAP(0x17c) + TRAP_HANDLER(prom_debug) ! 0x17d : debugger + TRAP_HANDLER(prom_debug) ! 0x17e : debugger breakpoint + BTRAP(0x17f) +tl1_resv180: BTRAPS(0x180) BTRAPS(0x188) +tl1_resv190: BTRAPS(0x190) BTRAPS(0x198) +tl1_resv1a0: BTRAPS(0x1a0) BTRAPS(0x1a8) +tl1_resv1b0: BTRAPS(0x1b0) BTRAPS(0x1b8) +tl1_resv1c0: BTRAPS(0x1c0) BTRAPS(0x1c8) +tl1_resv1d0: BTRAPS(0x1d0) BTRAPS(0x1d8) +tl1_resv1e0: BTRAPS(0x1e0) BTRAPS(0x1e8) +tl1_resv1f0: BTRAPS(0x1f0) BTRAPS(0x1f8) + + .section ".data" + .align 8 + .globl obp_ticks_pointer + + + ! Pointer to current tick value +obp_ticks_pointer: + .xword 0 + + ! Saved context state +debug_context: + .xword 0 + + .section ".text", "ax" + +spill_32bit: + srl %sp, 0, %sp + stw %l0, [%sp + 0x00] + stw %l1, [%sp + 0x04] + stw %l2, [%sp + 0x08] + stw %l3, [%sp + 0x0c] + stw %l4, [%sp + 0x10] + stw %l5, [%sp + 0x14] + stw %l6, [%sp + 0x18] + stw %l7, [%sp + 0x1c] + stw %i0, [%sp + 0x20] + stw %i1, [%sp + 0x24] + stw %i2, [%sp + 0x28] + stw %i3, [%sp + 0x2c] + stw %i4, [%sp + 0x30] + stw %i5, [%sp + 0x34] + stw %i6, [%sp + 0x38] + stw %i7, [%sp + 0x3c] + saved + retry + +fill_32bit: + srl %sp, 0, %sp + lduw [%sp + 0x00], %l0 + lduw [%sp + 0x04], %l1 + lduw [%sp + 0x08], %l2 + lduw [%sp + 0x0c], %l3 + lduw [%sp + 0x10], %l4 + lduw [%sp + 0x14], %l5 + lduw [%sp + 0x18], %l6 + lduw [%sp + 0x1c], %l7 + lduw [%sp + 0x20], %i0 + lduw [%sp + 0x24], %i1 + lduw [%sp + 0x28], %i2 + lduw [%sp + 0x2c], %i3 + lduw [%sp + 0x30], %i4 + lduw [%sp + 0x34], %i5 + lduw [%sp + 0x38], %i6 + lduw [%sp + 0x3c], %i7 + restored + retry + + + .globl reload_DMMU_tlb, reload_IMMU_tlb, bug + +reload_DMMU_tlb: + + /* Save CPU state to stack */ + setx _fcstack_ptr, %g6, %g7 + ldx [%g7], %g1 + add %g1, -CONTEXT_STATE_SIZE, %g1 + stx %g1, [%g7] + + SAVE_CPU_STATE(dtlb) + + RESET_CPU_WINDOW_STATE(dtlb) + + /* Switch to ordinary globals, saving to context */ + mov %g1, %o1 + rdpr %pstate, %o2 + andn %o2, PSTATE_MG, %o2 + wrpr %o2, %pstate + + stx %g1, [%o1 + 0x30] + stx %g2, [%o1 + 0x38] + stx %g3, [%o1 + 0x40] + stx %g4, [%o1 + 0x48] + stx %g5, [%o1 + 0x50] + stx %g6, [%o1 + 0x58] + stx %g7, [%o1 + 0x60] + + /* Copy context back to %g1 */ + mov %o1, %g1 + + /* Switch to 8K TLB locked OpenBIOS stack (note we add an additional 192 bytes required for + gcc to save its arguments when building with -O0) */ + setx _fcstack_ptr, %g6, %g7 + ldx [%g7], %g6 + setx CONTEXT_STACK_SIZE, %g4, %g5 + sub %g6, %g5, %g6 + stx %g6, [%g7] + + setx - 2047 - 192, %g6, %g7 + add %g1, %g7, %g7 + mov %g7, %sp + + /* Enable interrupts for window spill/fill traps */ + rdpr %pstate, %g7 + or %g7, PSTATE_IE, %g7 + wrpr %g7, %pstate + + call dtlb_miss_handler + nop + + /* Disable interrupts */ + rdpr %pstate, %g7 + andn %g7, PSTATE_IE, %g7 + wrpr %g7, %pstate + + /* Restore CPU state from stack */ + setx _fcstack_ptr, %g6, %g7 + ldx [%g7], %g1 + setx CONTEXT_STACK_SIZE, %g4, %g5 + add %g1, %g5, %g1 + stx %g1, [%g7] + + /* Restore ordinary globals, switch back to memory globals */ + mov %g1, %o1 + rdpr %pstate, %o2 + or %o2, PSTATE_MG, %o2 + + ldx [%o1 + 0x30], %g1 + ldx [%o1 + 0x38], %g2 + ldx [%o1 + 0x40], %g3 + ldx [%o1 + 0x48], %g4 + ldx [%o1 + 0x50], %g5 + ldx [%o1 + 0x58], %g6 + ldx [%o1 + 0x60], %g7 + + wrpr %o2, %pstate + mov %o1, %g1 + + RESTORE_CPU_STATE(dtlb) + + setx _fcstack_ptr, %g6, %g7 + ldx [%g7], %g1 + add %g1, CONTEXT_STATE_SIZE, %g1 + stx %g1, [%g7] + + retry + +reload_IMMU_tlb: + + /* Save CPU state to stack */ + setx _fcstack_ptr, %g6, %g7 + ldx [%g7], %g1 + add %g1, -CONTEXT_STATE_SIZE, %g1 + stx %g1, [%g7] + + SAVE_CPU_STATE(itlb) + + RESET_CPU_WINDOW_STATE(itlb) + + /* Switch to ordinary globals, saving to context */ + mov %g1, %o1 + rdpr %pstate, %o2 + andn %o2, PSTATE_MG, %o2 + wrpr %o2, %pstate + + stx %g1, [%o1 + 0x30] + stx %g2, [%o1 + 0x38] + stx %g3, [%o1 + 0x40] + stx %g4, [%o1 + 0x48] + stx %g5, [%o1 + 0x50] + stx %g6, [%o1 + 0x58] + stx %g7, [%o1 + 0x60] + + /* Copy context back to %g1 */ + mov %o1, %g1 + + /* Switch to 8K TLB locked OpenBIOS stack (note we add an additional 192 bytes required for + gcc to save its arguments when building with -O0) */ + setx _fcstack_ptr, %g6, %g7 + ldx [%g7], %g6 + setx CONTEXT_STACK_SIZE, %g4, %g5 + sub %g6, %g5, %g6 + stx %g6, [%g7] + + setx - 2047 - 192, %g6, %g7 + add %g1, %g7, %g7 + mov %g7, %sp + + /* Enable interrupts for window spill/fill traps */ + rdpr %pstate, %g7 + or %g7, PSTATE_IE, %g7 + wrpr %g7, %pstate + + call itlb_miss_handler + nop + + /* Disable interrupts */ + rdpr %pstate, %g7 + andn %g7, PSTATE_IE, %g7 + wrpr %g7, %pstate + + /* Restore CPU state from stack */ + setx _fcstack_ptr, %g6, %g7 + ldx [%g7], %g1 + setx CONTEXT_STACK_SIZE, %g4, %g5 + add %g1, %g5, %g1 + stx %g1, [%g7] + + /* Restore ordinary globals, switch back to memory globals */ + mov %g1, %o1 + rdpr %pstate, %o2 + or %o2, PSTATE_MG, %o2 + + ldx [%o1 + 0x30], %g1 + ldx [%o1 + 0x38], %g2 + ldx [%o1 + 0x40], %g3 + ldx [%o1 + 0x48], %g4 + ldx [%o1 + 0x50], %g5 + ldx [%o1 + 0x58], %g6 + ldx [%o1 + 0x60], %g7 + + wrpr %o2, %pstate + mov %o1, %g1 + + RESTORE_CPU_STATE(itlb) + + setx _fcstack_ptr, %g6, %g7 + ldx [%g7], %g1 + add %g1, CONTEXT_STATE_SIZE, %g1 + stx %g1, [%g7] + + retry + + + .globl prom_debug_handler + +prom_debug: + + /* Make sure all windows are on the stack */ + flushw + + rdpr %tl, %g7 + rdpr %tpc, %g6 + rdpr %tnpc, %g5 + + /* Save CPU state to stack */ + setx _fcstack_ptr, %g6, %g7 + ldx [%g7], %g1 + add %g1, -CONTEXT_STATE_SIZE, %g1 + stx %g1, [%g7] + + SAVE_CPU_STATE(prom_debug) + + RESET_CPU_WINDOW_STATE(prom_debug) + + /* Switch to ordinary globals, saving to context */ + mov %g1, %o1 + rdpr %pstate, %o2 + andn %o2, PSTATE_AG, %o2 + wrpr %o2, %pstate + + stx %g1, [%o1 + 0x30] + stx %g2, [%o1 + 0x38] + stx %g3, [%o1 + 0x40] + stx %g4, [%o1 + 0x48] + stx %g5, [%o1 + 0x50] + stx %g6, [%o1 + 0x58] + stx %g7, [%o1 + 0x60] + + /* Copy context back to %g1 */ + mov %o1, %g1 + + /* Update __context to point to saved area */ + setx __context, %g6, %g7 + ldx [%g7], %g3 + setx debug_context, %g4, %g5 + stx %g3, [%g5] + stx %g1, [%g7] + + /* Switch to TLB locked OpenBIOS stack space (note we add an additional 192 bytes required for + gcc to save its arguments when building with -O0) */ + setx _fcstack_ptr, %g6, %g7 + ldx [%g7], %g6 + setx CONTEXT_STACK_SIZE, %g4, %g5 + sub %g6, %g5, %g6 + stx %g6, [%g7] + + setx - 2047 - 192, %g6, %g7 + add %g1, %g7, %g7 + mov %g7, %sp + + /* Enable interrupts for window spill/fill traps */ + rdpr %pstate, %g7 + or %g7, PSTATE_IE, %g7 + wrpr %g7, %pstate + + call prom_debug_handler + nop + + /* Disable interrupts */ + rdpr %pstate, %g7 + andn %g7, PSTATE_IE, %g7 + wrpr %g7, %pstate + + /* Restore CPU state from stack */ + setx _fcstack_ptr, %g6, %g7 + ldx [%g7], %g1 + setx CONTEXT_STACK_SIZE, %g4, %g5 + add %g1, %g5, %g1 + stx %g1, [%g7] + + /* Restore ordinary globals, switch back to alternate globals */ + mov %g1, %o1 + rdpr %pstate, %o2 + or %o2, PSTATE_AG, %o2 + + ldx [%o1 + 0x30], %g1 + ldx [%o1 + 0x38], %g2 + ldx [%o1 + 0x40], %g3 + ldx [%o1 + 0x48], %g4 + ldx [%o1 + 0x50], %g5 + ldx [%o1 + 0x58], %g6 + ldx [%o1 + 0x60], %g7 + + wrpr %o2, %pstate + mov %o1, %g1 + + RESTORE_CPU_STATE(prom_debug) + + /* Restore __context */ + setx debug_context, %g4, %g5 + ldx [%g5], %g3 + setx __context, %g6, %g7 + stx %g3, [%g7] + + setx _fcstack_ptr, %g6, %g7 + ldx [%g7], %g1 + add %g1, CONTEXT_STATE_SIZE, %g1 + stx %g1, [%g7] + + done + + +softint_irq_tl1: +softint_irq: + mov 1, %g2 + /* clear tick interrupt */ + wr %g2, 0x0, %clear_softint + sll %g2, %g1, %g2 + sra %g2, 0, %g2 + /* clear softint interrupt */ + wr %g2, 0x0, %clear_softint + + setx TICK_INT_DIS, %g2, %g1 + rd %tick, %g2 + and %g1, %g2, %g1 + brnz,pn %g1, tick_compare_disabled + nop + + /* update tick value if pointer set */ + setx obp_ticks_pointer, %g3, %g1 + ldx [%g1], %g3 + brz %g3, tick_rearm + nop + + ldx [%g3], %g1 + add %g1, 10, %g1 ! 100Hz = 10ms + stx %g1, [%g3] + +tick_rearm: + set TICK_INTERVAL, %g1 + add %g1, %g2, %g1 + wr %g1, 0, %tick_cmpr +tick_compare_disabled: + retry + +handler_irq: +__divide_error: +bug: + /* Dump the exception and its context */ + ! Set up CPU state + ! Don't change the global register set or we lose %g1 (exception level) + rdpr %pstate, %g2 + or %g2, PSTATE_PRIV, %g2 + wrpr %g2, %pstate + wr %g0, 0, %fprs + + ! Jump to ROM ... + setx _start, %g2, %g3 + setx highmem, %g2, %g4 + sub %g4, %g3, %g4 + setx PROM_ADDR, %g2, %g3 + add %g4, %g3, %g3 + jmp %g3 + ! ... while disabling I/D MMUs and caches + stxa %g0, [%g0] ASI_LSU_CONTROL + +highmem: + ! Extract NWINDOWS from %ver + rdpr %ver, %g2 + and %g2, 0xf, %g2 + wrpr %g2, 0, %cleanwin + wrpr %g2, 0, %cansave + wrpr %g0, 0, %canrestore + wrpr %g0, 0, %otherwin + wrpr %g0, 0, %wstate + + b dump_exception + nop + +outstr: + /* void outstr (unsigned long port, const unsigned char *str); + * Writes a string on an IO port. + */ +1: ldub [%o1], %o3 + cmp %o3, 0 + be 2f + nop + stba %o3, [%o0] ASI_BP + b 1b + inc %o1 +2: retl + nop + +outdigit: + /* void outdigit (unsigned long port, uint8_t digit); + * Dumps a single digit on serial port. + */ + add %o1, '0', %o1 + retl + stba %o1, [%o0] ASI_BP + +outhex: + /* void outhex (unsigned long port, uint64_t value); + * Dumps a 64 bits hex number on serial port + */ + mov %o1, %o2 + set 60, %o3 + srlx %o2, %o3, %o1 +1: and %o1, 0xf, %o1 + cmp %o1, 9 + bgt 2f + nop + b 3f + add %o1, '0', %o1 +2: add %o1, 'a' - 10, %o1 +3: stba %o1, [%o0] ASI_BP + subcc %o3, 4, %o3 + bge 1b + srlx %o2, %o3, %o1 + retl + nop + + /* void dump_exception (); + * + * Dump a message when catching an exception + */ +dump_exception: + setx SER_ADDR, %o3, %o0 + set _start, %g3 + set (_BUG_message_0), %o1 + sub %o1, %g3, %g4 + setx PROM_ADDR, %g2, %g3 + add %g4, %g3, %g3 + call outstr + mov %g3, %o1 + + call outhex + mov %g1, %o1 + + call outstr + add %g3, (_BUG_message_1 - _BUG_message_0), %o1 + + call outhex + rdpr %tpc, %o1 + + call outstr + add %g3, (_BUG_message_2 - _BUG_message_0), %o1 + + call outhex + rdpr %tnpc, %o1 + + call outstr + add %g3, (_BUG_message_3 - _BUG_message_0), %o1 + +_forever: + /* Loop forever */ + b _forever ; + nop + + .section .rodata +_BUG_message_0: + .string "Unhandled Exception 0x" +_BUG_message_1: + .string "\nPC = 0x" +_BUG_message_2: + .string " NPC = 0x" +_BUG_message_3: + .string "\nStopping execution\n" |