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/* $Id: head.h,v 1.39 2000/05/26 22:18:45 ecd Exp $ */
#ifndef __SPARC_HEAD_H
#define __SPARC_HEAD_H
#define KERNBASE 0xf0000000 /* First address the kernel will eventually be */
#define LOAD_ADDR 0x4000 /* prom jumps to us here unless this is elf /boot */
#define SUN4C_SEGSZ (1 << 18)
#define SRMMU_L1_KBASE_OFFSET ((KERNBASE>>24)<<2) /* Used in boot remapping. */
#define INTS_ENAB 0x01 /* entry.S uses this. */
#define SUN4_PROM_VECTOR 0xFFE81000 /* SUN4 PROM needs to be hardwired */
#define WRITE_PAUSE nop; nop; nop; /* Have to do this after %wim/%psr chg */
#define NOP_INSN 0x01000000 /* Used to patch sparc_save_state */
/* Here are some trap goodies */
/* Generic trap entry. */
#define TRAP_ENTRY(type, label) \
rd %psr, %l0; b label; rd %wim, %l3; nop;
/* Data/text faults. Defaults to sun4c version at boot time. */
#define SPARC_TFAULT rd %psr, %l0; rd %wim, %l3; b sun4c_fault; mov 1, %l7;
#define SPARC_DFAULT rd %psr, %l0; rd %wim, %l3; b sun4c_fault; mov 0, %l7;
#define SRMMU_TFAULT rd %psr, %l0; rd %wim, %l3; b srmmu_fault; mov 1, %l7;
#define SRMMU_DFAULT rd %psr, %l0; rd %wim, %l3; b srmmu_fault; mov 0, %l7;
/* This is for traps we should NEVER get. */
#define BAD_TRAP(num) \
rd %psr, %l0; mov num, %l7; b bad_trap_handler; rd %wim, %l3;
/* This is for traps when we want just skip the instruction which caused it */
#define SKIP_TRAP(type, name) \
jmpl %l2, %g0; rett %l2 + 4; nop; nop;
/* Notice that for the system calls we pull a trick. We load up a
* different pointer to the system call vector table in %l7, but call
* the same generic system call low-level entry point. The trap table
* entry sequences are also HyperSparc pipeline friendly ;-)
*/
/* Software trap for Linux system calls. */
#define LINUX_SYSCALL_TRAP \
sethi %hi(sys_call_table), %l7; \
or %l7, %lo(sys_call_table), %l7; \
b linux_sparc_syscall; \
rd %psr, %l0;
#define BREAKPOINT_TRAP \
b breakpoint_trap; \
rd %psr,%l0; \
nop; \
nop;
#ifdef CONFIG_KGDB
#define KGDB_TRAP(num) \
b kgdb_trap_low; \
rd %psr,%l0; \
nop; \
nop;
#else
#define KGDB_TRAP(num) \
BAD_TRAP(num)
#endif
/* The Get Condition Codes software trap for userland. */
#define GETCC_TRAP \
b getcc_trap_handler; mov %psr, %l0; nop; nop;
/* The Set Condition Codes software trap for userland. */
#define SETCC_TRAP \
b setcc_trap_handler; mov %psr, %l0; nop; nop;
/* The Get PSR software trap for userland. */
#define GETPSR_TRAP \
mov %psr, %i0; jmp %l2; rett %l2 + 4; nop;
/* This is for hard interrupts from level 1-14, 15 is non-maskable (nmi) and
* gets handled with another macro.
*/
#define TRAP_ENTRY_INTERRUPT(int_level) \
mov int_level, %l7; rd %psr, %l0; b real_irq_entry; rd %wim, %l3;
/* NMI's (Non Maskable Interrupts) are special, you can't keep them
* from coming in, and basically if you get one, the shows over. ;(
* On the sun4c they are usually asynchronous memory errors, on the
* the sun4m they could be either due to mem errors or a software
* initiated interrupt from the prom/kern on an SMP box saying "I
* command you to do CPU tricks, read your mailbox for more info."
*/
#define NMI_TRAP \
rd %wim, %l3; b linux_trap_nmi_sun4c; mov %psr, %l0; nop;
/* Window overflows/underflows are special and we need to try to be as
* efficient as possible here....
*/
#define WINDOW_SPILL \
rd %psr, %l0; rd %wim, %l3; b spill_window_entry; andcc %l0, PSR_PS, %g0;
#define WINDOW_FILL \
rd %psr, %l0; rd %wim, %l3; b fill_window_entry; andcc %l0, PSR_PS, %g0;
#endif /* __SPARC_HEAD_H */
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