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f5e706ad SR |
1 | #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 */ |