1/* $Id: head.h,v 1.1.1.1 2007/08/03 18:53:36 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 */
126