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/* $Id: head.h,v 1.1 2005-12-20 11:32:11 jcastillo 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 NCPUS            4              /* Architectural limit of sun4m. */

#define SUN4_PROM_VECTOR 0xFFE81000     /* To safely die on a SUN4 */

#define SUN4_PRINTF      0x84           /* Offset into SUN4_PROM_VECTOR */

#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 C_LABEL(srmmu_fault); mov 1, %l7;

#define SRMMU_DFAULT rd %psr, %l0; rd %wim, %l3; b C_LABEL(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;

/* 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(C_LABEL(sys_call_table)), %l7; \

        or %l7, %lo(C_LABEL(sys_call_table)), %l7; \

        b linux_sparc_syscall; \

        rd %psr, %l0;

/* Software trap for SunOS4.1.x system calls. */

#define SUNOS_SYSCALL_TRAP \

        rd %psr, %l0; \

        sethi %hi(C_LABEL(sunos_sys_table)), %l7; \

        b linux_sparc_syscall; \

        or %l7, %lo(C_LABEL(sunos_sys_table)), %l7;

/* Software trap for Slowaris system calls. */

#define SOLARIS_SYSCALL_TRAP \

        sethi %hi(C_LABEL(sys_call_table)), %l7; \

        or %l7, %lo(C_LABEL(sys_call_table)), %l7; \

        b solaris_syscall; \

        rd %psr, %l0;

/* Software trap for Sparc-netbsd system calls. */

#define NETBSD_SYSCALL_TRAP \

        sethi %hi(C_LABEL(sys_call_table)), %l7; \

        or %l7, %lo(C_LABEL(sys_call_table)), %l7; \

        b bsd_syscall; \

        rd %psr, %l0;

/* 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;

/* 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