xref: /openbmc/linux/arch/sparc/include/asm/head_32.h (revision b2441318)
1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef __SPARC_HEAD_H
3 #define __SPARC_HEAD_H
4 
5 #define KERNBASE        0xf0000000  /* First address the kernel will eventually be */
6 
7 #define WRITE_PAUSE      nop; nop; nop; /* Have to do this after %wim/%psr chg */
8 
9 /* Here are some trap goodies */
10 
11 /* Generic trap entry. */
12 #define TRAP_ENTRY(type, label) \
13 	rd %psr, %l0; b label; rd %wim, %l3; nop;
14 
15 /* Data/text faults */
16 #define SRMMU_TFAULT rd %psr, %l0; rd %wim, %l3; b srmmu_fault; mov 1, %l7;
17 #define SRMMU_DFAULT rd %psr, %l0; rd %wim, %l3; b srmmu_fault; mov 0, %l7;
18 
19 /* This is for traps we should NEVER get. */
20 #define BAD_TRAP(num) \
21         rd %psr, %l0; mov num, %l7; b bad_trap_handler; rd %wim, %l3;
22 
23 /* This is for traps when we want just skip the instruction which caused it */
24 #define SKIP_TRAP(type, name) \
25 	jmpl %l2, %g0; rett %l2 + 4; nop; nop;
26 
27 /* Notice that for the system calls we pull a trick.  We load up a
28  * different pointer to the system call vector table in %l7, but call
29  * the same generic system call low-level entry point.  The trap table
30  * entry sequences are also HyperSparc pipeline friendly ;-)
31  */
32 
33 /* Software trap for Linux system calls. */
34 #define LINUX_SYSCALL_TRAP \
35         sethi %hi(sys_call_table), %l7; \
36         or %l7, %lo(sys_call_table), %l7; \
37         b linux_sparc_syscall; \
38         rd %psr, %l0;
39 
40 #define BREAKPOINT_TRAP \
41 	b breakpoint_trap; \
42 	rd %psr,%l0; \
43 	nop; \
44 	nop;
45 
46 #ifdef CONFIG_KGDB
47 #define KGDB_TRAP(num)                  \
48 	mov num, %l7;                   \
49 	b kgdb_trap_low;                \
50 	rd %psr,%l0;                    \
51 	nop;
52 #else
53 #define KGDB_TRAP(num) \
54 	BAD_TRAP(num)
55 #endif
56 
57 /* The Get Condition Codes software trap for userland. */
58 #define GETCC_TRAP \
59         b getcc_trap_handler; rd %psr, %l0; nop; nop;
60 
61 /* The Set Condition Codes software trap for userland. */
62 #define SETCC_TRAP \
63         b setcc_trap_handler; rd %psr, %l0; nop; nop;
64 
65 /* The Get PSR software trap for userland. */
66 #define GETPSR_TRAP \
67 	rd %psr, %i0; jmp %l2; rett %l2 + 4; nop;
68 
69 /* This is for hard interrupts from level 1-14, 15 is non-maskable (nmi) and
70  * gets handled with another macro.
71  */
72 #define TRAP_ENTRY_INTERRUPT(int_level) \
73         mov int_level, %l7; rd %psr, %l0; b real_irq_entry; rd %wim, %l3;
74 
75 /* Window overflows/underflows are special and we need to try to be as
76  * efficient as possible here....
77  */
78 #define WINDOW_SPILL \
79         rd %psr, %l0; rd %wim, %l3; b spill_window_entry; andcc %l0, PSR_PS, %g0;
80 
81 #define WINDOW_FILL \
82         rd %psr, %l0; rd %wim, %l3; b fill_window_entry; andcc %l0, PSR_PS, %g0;
83 
84 #endif /* __SPARC_HEAD_H */
85