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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 | ||
49 | /* Software trap for SunOS4.1.x system calls. */ | |
50 | #define SUNOS_SYSCALL_TRAP \ | |
51 | rd %psr, %l0; \ | |
52 | sethi %hi(sunos_sys_table), %l7; \ | |
53 | b linux_sparc_syscall; \ | |
54 | or %l7, %lo(sunos_sys_table), %l7; | |
55 | ||
56 | #define SUNOS_NO_SYSCALL_TRAP \ | |
57 | b sunos_syscall; \ | |
58 | rd %psr, %l0; \ | |
59 | nop; \ | |
60 | nop; | |
61 | ||
62 | /* Software trap for Slowaris system calls. */ | |
63 | #define SOLARIS_SYSCALL_TRAP \ | |
64 | b solaris_syscall; \ | |
65 | rd %psr, %l0; \ | |
66 | nop; \ | |
67 | nop; | |
68 | ||
69 | #define INDIRECT_SOLARIS_SYSCALL(x) \ | |
70 | mov x, %g1; \ | |
71 | b solaris_syscall; \ | |
72 | rd %psr, %l0; \ | |
73 | nop; | |
74 | ||
75 | #define BREAKPOINT_TRAP \ | |
76 | b breakpoint_trap; \ | |
77 | rd %psr,%l0; \ | |
78 | nop; \ | |
79 | nop; | |
80 | ||
81 | /* Software trap for Sparc-netbsd system calls. */ | |
82 | #define NETBSD_SYSCALL_TRAP \ | |
83 | sethi %hi(sys_call_table), %l7; \ | |
84 | or %l7, %lo(sys_call_table), %l7; \ | |
85 | b bsd_syscall; \ | |
86 | rd %psr, %l0; | |
87 | ||
88 | /* The Get Condition Codes software trap for userland. */ | |
89 | #define GETCC_TRAP \ | |
90 | b getcc_trap_handler; mov %psr, %l0; nop; nop; | |
91 | ||
92 | /* The Set Condition Codes software trap for userland. */ | |
93 | #define SETCC_TRAP \ | |
94 | b setcc_trap_handler; mov %psr, %l0; nop; nop; | |
95 | ||
96 | /* The Get PSR software trap for userland. */ | |
97 | #define GETPSR_TRAP \ | |
98 | mov %psr, %i0; jmp %l2; rett %l2 + 4; nop; | |
99 | ||
100 | /* This is for hard interrupts from level 1-14, 15 is non-maskable (nmi) and | |
101 | * gets handled with another macro. | |
102 | */ | |
103 | #define TRAP_ENTRY_INTERRUPT(int_level) \ | |
104 | mov int_level, %l7; rd %psr, %l0; b real_irq_entry; rd %wim, %l3; | |
105 | ||
106 | /* NMI's (Non Maskable Interrupts) are special, you can't keep them | |
107 | * from coming in, and basically if you get one, the shows over. ;( | |
108 | * On the sun4c they are usually asynchronous memory errors, on the | |
109 | * the sun4m they could be either due to mem errors or a software | |
110 | * initiated interrupt from the prom/kern on an SMP box saying "I | |
111 | * command you to do CPU tricks, read your mailbox for more info." | |
112 | */ | |
113 | #define NMI_TRAP \ | |
114 | rd %wim, %l3; b linux_trap_nmi_sun4c; mov %psr, %l0; nop; | |
115 | ||
116 | /* Window overflows/underflows are special and we need to try to be as | |
117 | * efficient as possible here.... | |
118 | */ | |
119 | #define WINDOW_SPILL \ | |
120 | rd %psr, %l0; rd %wim, %l3; b spill_window_entry; andcc %l0, PSR_PS, %g0; | |
121 | ||
122 | #define WINDOW_FILL \ | |
123 | rd %psr, %l0; rd %wim, %l3; b fill_window_entry; andcc %l0, PSR_PS, %g0; | |
124 | ||
125 | #endif /* __SPARC_HEAD_H */ |