File: /usr/src/linux/include/asm-sparc/head.h
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 C_LABEL(srmmu_fault); mov 1, %l7;
26 #define SRMMU_DFAULT rd %psr, %l0; rd %wim, %l3; b C_LABEL(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(C_LABEL(sys_call_table)), %l7; \
45 or %l7, %lo(C_LABEL(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(C_LABEL(sunos_sys_table)), %l7; \
53 b linux_sparc_syscall; \
54 or %l7, %lo(C_LABEL(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(C_LABEL(sys_call_table)), %l7; \
84 or %l7, %lo(C_LABEL(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 */
126