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Sam Ravnborgf5e706a2008-07-17 21:55:51 -07001#ifndef __SPARC_HEAD_H
2#define __SPARC_HEAD_H
3
4#define KERNBASE 0xf0000000 /* First address the kernel will eventually be */
5#define LOAD_ADDR 0x4000 /* prom jumps to us here unless this is elf /boot */
6#define SUN4C_SEGSZ (1 << 18)
7#define SRMMU_L1_KBASE_OFFSET ((KERNBASE>>24)<<2) /* Used in boot remapping. */
8#define INTS_ENAB 0x01 /* entry.S uses this. */
9
10#define SUN4_PROM_VECTOR 0xFFE81000 /* SUN4 PROM needs to be hardwired */
11
12#define WRITE_PAUSE nop; nop; nop; /* Have to do this after %wim/%psr chg */
13#define NOP_INSN 0x01000000 /* Used to patch sparc_save_state */
14
15/* Here are some trap goodies */
16
17/* Generic trap entry. */
18#define TRAP_ENTRY(type, label) \
19 rd %psr, %l0; b label; rd %wim, %l3; nop;
20
21/* Data/text faults. Defaults to sun4c version at boot time. */
22#define SPARC_TFAULT rd %psr, %l0; rd %wim, %l3; b sun4c_fault; mov 1, %l7;
23#define SPARC_DFAULT rd %psr, %l0; rd %wim, %l3; b sun4c_fault; mov 0, %l7;
24#define SRMMU_TFAULT rd %psr, %l0; rd %wim, %l3; b srmmu_fault; mov 1, %l7;
25#define SRMMU_DFAULT rd %psr, %l0; rd %wim, %l3; b srmmu_fault; mov 0, %l7;
26
27/* This is for traps we should NEVER get. */
28#define BAD_TRAP(num) \
29 rd %psr, %l0; mov num, %l7; b bad_trap_handler; rd %wim, %l3;
30
31/* This is for traps when we want just skip the instruction which caused it */
32#define SKIP_TRAP(type, name) \
33 jmpl %l2, %g0; rett %l2 + 4; nop; nop;
34
35/* Notice that for the system calls we pull a trick. We load up a
36 * different pointer to the system call vector table in %l7, but call
37 * the same generic system call low-level entry point. The trap table
38 * entry sequences are also HyperSparc pipeline friendly ;-)
39 */
40
41/* Software trap for Linux system calls. */
42#define LINUX_SYSCALL_TRAP \
43 sethi %hi(sys_call_table), %l7; \
44 or %l7, %lo(sys_call_table), %l7; \
45 b linux_sparc_syscall; \
46 rd %psr, %l0;
47
48#define BREAKPOINT_TRAP \
49 b breakpoint_trap; \
50 rd %psr,%l0; \
51 nop; \
52 nop;
53
54#ifdef CONFIG_KGDB
55#define KGDB_TRAP(num) \
56 b kgdb_trap_low; \
57 rd %psr,%l0; \
58 nop; \
59 nop;
60#else
61#define KGDB_TRAP(num) \
62 BAD_TRAP(num)
63#endif
64
65/* The Get Condition Codes software trap for userland. */
66#define GETCC_TRAP \
67 b getcc_trap_handler; mov %psr, %l0; nop; nop;
68
69/* The Set Condition Codes software trap for userland. */
70#define SETCC_TRAP \
71 b setcc_trap_handler; mov %psr, %l0; nop; nop;
72
73/* The Get PSR software trap for userland. */
74#define GETPSR_TRAP \
75 mov %psr, %i0; jmp %l2; rett %l2 + 4; nop;
76
77/* This is for hard interrupts from level 1-14, 15 is non-maskable (nmi) and
78 * gets handled with another macro.
79 */
80#define TRAP_ENTRY_INTERRUPT(int_level) \
81 mov int_level, %l7; rd %psr, %l0; b real_irq_entry; rd %wim, %l3;
82
83/* NMI's (Non Maskable Interrupts) are special, you can't keep them
84 * from coming in, and basically if you get one, the shows over. ;(
85 * On the sun4c they are usually asynchronous memory errors, on the
86 * the sun4m they could be either due to mem errors or a software
87 * initiated interrupt from the prom/kern on an SMP box saying "I
88 * command you to do CPU tricks, read your mailbox for more info."
89 */
90#define NMI_TRAP \
91 rd %wim, %l3; b linux_trap_nmi_sun4c; mov %psr, %l0; nop;
92
93/* Window overflows/underflows are special and we need to try to be as
94 * efficient as possible here....
95 */
96#define WINDOW_SPILL \
97 rd %psr, %l0; rd %wim, %l3; b spill_window_entry; andcc %l0, PSR_PS, %g0;
98
99#define WINDOW_FILL \
100 rd %psr, %l0; rd %wim, %l3; b fill_window_entry; andcc %l0, PSR_PS, %g0;
101
102#endif /* __SPARC_HEAD_H */