1 /* $Id: head.h,v 1.39 2000/05/26 22:18:45 ecd Exp $ */
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. */
11 #define SUN4_PROM_VECTOR 0xFFE81000 /* SUN4 PROM needs to be hardwired */
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 */
16 /* Here are some trap goodies */
18 /* Generic trap entry. */
19 #define TRAP_ENTRY(type, label) \
20 rd %psr, %l0; b label; rd %wim, %l3; nop;
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;
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;
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;
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 ;-)
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; \
49 #define BREAKPOINT_TRAP \
55 /* The Get Condition Codes software trap for userland. */
57 b getcc_trap_handler; mov %psr, %l0; nop; nop;
59 /* The Set Condition Codes software trap for userland. */
61 b setcc_trap_handler; mov %psr, %l0; nop; nop;
63 /* The Get PSR software trap for userland. */
65 mov %psr, %i0; jmp %l2; rett %l2 + 4; nop;
67 /* This is for hard interrupts from level 1-14, 15 is non-maskable (nmi) and
68 * gets handled with another macro.
70 #define TRAP_ENTRY_INTERRUPT(int_level) \
71 mov int_level, %l7; rd %psr, %l0; b real_irq_entry; rd %wim, %l3;
73 /* NMI's (Non Maskable Interrupts) are special, you can't keep them
74 * from coming in, and basically if you get one, the shows over. ;(
75 * On the sun4c they are usually asynchronous memory errors, on the
76 * the sun4m they could be either due to mem errors or a software
77 * initiated interrupt from the prom/kern on an SMP box saying "I
78 * command you to do CPU tricks, read your mailbox for more info."
81 rd %wim, %l3; b linux_trap_nmi_sun4c; mov %psr, %l0; nop;
83 /* Window overflows/underflows are special and we need to try to be as
84 * efficient as possible here....
86 #define WINDOW_SPILL \
87 rd %psr, %l0; rd %wim, %l3; b spill_window_entry; andcc %l0, PSR_PS, %g0;
90 rd %psr, %l0; rd %wim, %l3; b fill_window_entry; andcc %l0, PSR_PS, %g0;
92 #endif /* __SPARC_HEAD_H */