| b.liu | e958203 | 2025-04-17 19:18:16 +0800 | [diff] [blame^] | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| 2 | #ifndef __SPARC_HEAD_H |
| 3 | #define __SPARC_HEAD_H |
| 4 | |
| 5 | #define KERNBASE 0xf0000000 /* First address the kernel will eventually be */ |
| 6 | |
| 7 | #define WRITE_PAUSE nop; nop; nop; /* Have to do this after %wim/%psr chg */ |
| 8 | |
| 9 | /* Here are some trap goodies */ |
| 10 | |
| 11 | /* Generic trap entry. */ |
| 12 | #define TRAP_ENTRY(type, label) \ |
| 13 | rd %psr, %l0; b label; rd %wim, %l3; nop; |
| 14 | |
| 15 | /* Data/text faults */ |
| 16 | #define SRMMU_TFAULT rd %psr, %l0; rd %wim, %l3; b srmmu_fault; mov 1, %l7; |
| 17 | #define SRMMU_DFAULT rd %psr, %l0; rd %wim, %l3; b srmmu_fault; mov 0, %l7; |
| 18 | |
| 19 | /* This is for traps we should NEVER get. */ |
| 20 | #define BAD_TRAP(num) \ |
| 21 | rd %psr, %l0; mov num, %l7; b bad_trap_handler; rd %wim, %l3; |
| 22 | |
| 23 | /* This is for traps when we want just skip the instruction which caused it */ |
| 24 | #define SKIP_TRAP(type, name) \ |
| 25 | jmpl %l2, %g0; rett %l2 + 4; nop; nop; |
| 26 | |
| 27 | /* Notice that for the system calls we pull a trick. We load up a |
| 28 | * different pointer to the system call vector table in %l7, but call |
| 29 | * the same generic system call low-level entry point. The trap table |
| 30 | * entry sequences are also HyperSparc pipeline friendly ;-) |
| 31 | */ |
| 32 | |
| 33 | /* Software trap for Linux system calls. */ |
| 34 | #define LINUX_SYSCALL_TRAP \ |
| 35 | sethi %hi(sys_call_table), %l7; \ |
| 36 | or %l7, %lo(sys_call_table), %l7; \ |
| 37 | b linux_sparc_syscall; \ |
| 38 | rd %psr, %l0; |
| 39 | |
| 40 | #define BREAKPOINT_TRAP \ |
| 41 | b breakpoint_trap; \ |
| 42 | rd %psr,%l0; \ |
| 43 | nop; \ |
| 44 | nop; |
| 45 | |
| 46 | #ifdef CONFIG_KGDB |
| 47 | #define KGDB_TRAP(num) \ |
| 48 | mov num, %l7; \ |
| 49 | b kgdb_trap_low; \ |
| 50 | rd %psr,%l0; \ |
| 51 | nop; |
| 52 | #else |
| 53 | #define KGDB_TRAP(num) \ |
| 54 | BAD_TRAP(num) |
| 55 | #endif |
| 56 | |
| 57 | /* The Get Condition Codes software trap for userland. */ |
| 58 | #define GETCC_TRAP \ |
| 59 | b getcc_trap_handler; rd %psr, %l0; nop; nop; |
| 60 | |
| 61 | /* The Set Condition Codes software trap for userland. */ |
| 62 | #define SETCC_TRAP \ |
| 63 | b setcc_trap_handler; rd %psr, %l0; nop; nop; |
| 64 | |
| 65 | /* The Get PSR software trap for userland. */ |
| 66 | #define GETPSR_TRAP \ |
| 67 | rd %psr, %i0; jmp %l2; rett %l2 + 4; nop; |
| 68 | |
| 69 | /* This is for hard interrupts from level 1-14, 15 is non-maskable (nmi) and |
| 70 | * gets handled with another macro. |
| 71 | */ |
| 72 | #define TRAP_ENTRY_INTERRUPT(int_level) \ |
| 73 | mov int_level, %l7; rd %psr, %l0; b real_irq_entry; rd %wim, %l3; |
| 74 | |
| 75 | /* Window overflows/underflows are special and we need to try to be as |
| 76 | * efficient as possible here.... |
| 77 | */ |
| 78 | #define WINDOW_SPILL \ |
| 79 | rd %psr, %l0; rd %wim, %l3; b spill_window_entry; andcc %l0, PSR_PS, %g0; |
| 80 | |
| 81 | #define WINDOW_FILL \ |
| 82 | rd %psr, %l0; rd %wim, %l3; b fill_window_entry; andcc %l0, PSR_PS, %g0; |
| 83 | |
| 84 | #endif /* __SPARC_HEAD_H */ |