Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* $Id: head.h,v 1.39 2000/05/26 22:18:45 ecd Exp $ */ |
2 | #ifndef __SPARC_HEAD_H | |
3 | #define __SPARC_HEAD_H | |
4 | ||
5 | #define KERNBASE 0xf0000000 /* First address the kernel will eventually be */ | |
6 | #define LOAD_ADDR 0x4000 /* prom jumps to us here unless this is elf /boot */ | |
7 | #define SUN4C_SEGSZ (1 << 18) | |
8 | #define SRMMU_L1_KBASE_OFFSET ((KERNBASE>>24)<<2) /* Used in boot remapping. */ | |
9 | #define INTS_ENAB 0x01 /* entry.S uses this. */ | |
10 | ||
11 | #define SUN4_PROM_VECTOR 0xFFE81000 /* SUN4 PROM needs to be hardwired */ | |
12 | ||
13 | #define WRITE_PAUSE nop; nop; nop; /* Have to do this after %wim/%psr chg */ | |
14 | #define NOP_INSN 0x01000000 /* Used to patch sparc_save_state */ | |
15 | ||
16 | /* Here are some trap goodies */ | |
17 | ||
18 | /* Generic trap entry. */ | |
19 | #define TRAP_ENTRY(type, label) \ | |
20 | rd %psr, %l0; b label; rd %wim, %l3; nop; | |
21 | ||
22 | /* Data/text faults. Defaults to sun4c version at boot time. */ | |
23 | #define SPARC_TFAULT rd %psr, %l0; rd %wim, %l3; b sun4c_fault; mov 1, %l7; | |
24 | #define SPARC_DFAULT rd %psr, %l0; rd %wim, %l3; b sun4c_fault; mov 0, %l7; | |
25 | #define SRMMU_TFAULT rd %psr, %l0; rd %wim, %l3; b srmmu_fault; mov 1, %l7; | |
26 | #define SRMMU_DFAULT rd %psr, %l0; rd %wim, %l3; b srmmu_fault; mov 0, %l7; | |
27 | ||
28 | /* This is for traps we should NEVER get. */ | |
29 | #define BAD_TRAP(num) \ | |
30 | rd %psr, %l0; mov num, %l7; b bad_trap_handler; rd %wim, %l3; | |
31 | ||
32 | /* This is for traps when we want just skip the instruction which caused it */ | |
33 | #define SKIP_TRAP(type, name) \ | |
34 | jmpl %l2, %g0; rett %l2 + 4; nop; nop; | |
35 | ||
36 | /* Notice that for the system calls we pull a trick. We load up a | |
37 | * different pointer to the system call vector table in %l7, but call | |
38 | * the same generic system call low-level entry point. The trap table | |
39 | * entry sequences are also HyperSparc pipeline friendly ;-) | |
40 | */ | |
41 | ||
42 | /* Software trap for Linux system calls. */ | |
43 | #define LINUX_SYSCALL_TRAP \ | |
44 | sethi %hi(sys_call_table), %l7; \ | |
45 | or %l7, %lo(sys_call_table), %l7; \ | |
46 | b linux_sparc_syscall; \ | |
47 | rd %psr, %l0; | |
48 | ||
1da177e4 LT |
49 | #define BREAKPOINT_TRAP \ |
50 | b breakpoint_trap; \ | |
51 | rd %psr,%l0; \ | |
52 | nop; \ | |
53 | nop; | |
54 | ||
e2fdd7fd DM |
55 | #ifdef CONFIG_KGDB |
56 | #define KGDB_TRAP(num) \ | |
57 | b kgdb_trap_low; \ | |
58 | rd %psr,%l0; \ | |
59 | nop; \ | |
60 | nop; | |
61 | #else | |
62 | #define KGDB_TRAP(num) \ | |
63 | BAD_TRAP(num) | |
64 | #endif | |
65 | ||
1da177e4 LT |
66 | /* The Get Condition Codes software trap for userland. */ |
67 | #define GETCC_TRAP \ | |
68 | b getcc_trap_handler; mov %psr, %l0; nop; nop; | |
69 | ||
70 | /* The Set Condition Codes software trap for userland. */ | |
71 | #define SETCC_TRAP \ | |
72 | b setcc_trap_handler; mov %psr, %l0; nop; nop; | |
73 | ||
74 | /* The Get PSR software trap for userland. */ | |
75 | #define GETPSR_TRAP \ | |
76 | mov %psr, %i0; jmp %l2; rett %l2 + 4; nop; | |
77 | ||
78 | /* This is for hard interrupts from level 1-14, 15 is non-maskable (nmi) and | |
79 | * gets handled with another macro. | |
80 | */ | |
81 | #define TRAP_ENTRY_INTERRUPT(int_level) \ | |
82 | mov int_level, %l7; rd %psr, %l0; b real_irq_entry; rd %wim, %l3; | |
83 | ||
84 | /* NMI's (Non Maskable Interrupts) are special, you can't keep them | |
85 | * from coming in, and basically if you get one, the shows over. ;( | |
86 | * On the sun4c they are usually asynchronous memory errors, on the | |
87 | * the sun4m they could be either due to mem errors or a software | |
88 | * initiated interrupt from the prom/kern on an SMP box saying "I | |
89 | * command you to do CPU tricks, read your mailbox for more info." | |
90 | */ | |
91 | #define NMI_TRAP \ | |
92 | rd %wim, %l3; b linux_trap_nmi_sun4c; mov %psr, %l0; nop; | |
93 | ||
94 | /* Window overflows/underflows are special and we need to try to be as | |
95 | * efficient as possible here.... | |
96 | */ | |
97 | #define WINDOW_SPILL \ | |
98 | rd %psr, %l0; rd %wim, %l3; b spill_window_entry; andcc %l0, PSR_PS, %g0; | |
99 | ||
100 | #define WINDOW_FILL \ | |
101 | rd %psr, %l0; rd %wim, %l3; b fill_window_entry; andcc %l0, PSR_PS, %g0; | |
102 | ||
103 | #endif /* __SPARC_HEAD_H */ |