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head_32.h
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1 #ifndef __SPARC_HEAD_H
2 #define __SPARC_HEAD_H
3 
4 #define KERNBASE 0xf0000000 /* First address the kernel will eventually be */
5 
6 #define WRITE_PAUSE nop; nop; nop; /* Have to do this after %wim/%psr chg */
7 
8 /* Here are some trap goodies */
9 
10 /* Generic trap entry. */
11 #define TRAP_ENTRY(type, label) \
12  rd %psr, %l0; b label; rd %wim, %l3; nop;
13 
14 /* Data/text faults */
15 #define SRMMU_TFAULT rd %psr, %l0; rd %wim, %l3; b srmmu_fault; mov 1, %l7;
16 #define SRMMU_DFAULT rd %psr, %l0; rd %wim, %l3; b srmmu_fault; mov 0, %l7;
17 
18 /* This is for traps we should NEVER get. */
19 #define BAD_TRAP(num) \
20  rd %psr, %l0; mov num, %l7; b bad_trap_handler; rd %wim, %l3;
21 
22 /* This is for traps when we want just skip the instruction which caused it */
23 #define SKIP_TRAP(type, name) \
24  jmpl %l2, %g0; rett %l2 + 4; nop; nop;
25 
26 /* Notice that for the system calls we pull a trick. We load up a
27  * different pointer to the system call vector table in %l7, but call
28  * the same generic system call low-level entry point. The trap table
29  * entry sequences are also HyperSparc pipeline friendly ;-)
30  */
31 
32 /* Software trap for Linux system calls. */
33 #define LINUX_SYSCALL_TRAP \
34  sethi %hi(sys_call_table), %l7; \
35  or %l7, %lo(sys_call_table), %l7; \
36  b linux_sparc_syscall; \
37  rd %psr, %l0;
38 
39 #define BREAKPOINT_TRAP \
40  b breakpoint_trap; \
41  rd %psr,%l0; \
42  nop; \
43  nop;
44 
45 #ifdef CONFIG_KGDB
46 #define KGDB_TRAP(num) \
47  b kgdb_trap_low; \
48  rd %psr,%l0; \
49  nop; \
50  nop;
51 #else
52 #define KGDB_TRAP(num) \
53  BAD_TRAP(num)
54 #endif
55 
56 /* The Get Condition Codes software trap for userland. */
57 #define GETCC_TRAP \
58  b getcc_trap_handler; mov %psr, %l0; nop; nop;
59 
60 /* The Set Condition Codes software trap for userland. */
61 #define SETCC_TRAP \
62  b setcc_trap_handler; mov %psr, %l0; nop; nop;
63 
64 /* The Get PSR software trap for userland. */
65 #define GETPSR_TRAP \
66  mov %psr, %i0; jmp %l2; rett %l2 + 4; nop;
67 
68 /* This is for hard interrupts from level 1-14, 15 is non-maskable (nmi) and
69  * gets handled with another macro.
70  */
71 #define TRAP_ENTRY_INTERRUPT(int_level) \
72  mov int_level, %l7; rd %psr, %l0; b real_irq_entry; rd %wim, %l3;
73 
74 /* Window overflows/underflows are special and we need to try to be as
75  * efficient as possible here....
76  */
77 #define WINDOW_SPILL \
78  rd %psr, %l0; rd %wim, %l3; b spill_window_entry; andcc %l0, PSR_PS, %g0;
79 
80 #define WINDOW_FILL \
81  rd %psr, %l0; rd %wim, %l3; b fill_window_entry; andcc %l0, PSR_PS, %g0;
82 
83 #endif /* __SPARC_HEAD_H */