1 /* $Id: head.h,v 1.39 2000/05/26 22:18:45 ecd Exp $ */ 2 #ifndef __SPARC_HEAD_H 3 #define __SPARC_HEAD_H 4 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. */ 10 11 #define SUN4_PROM_VECTOR 0xFFE81000 /* SUN4 PROM needs to be hardwired */ 12 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 */ 15 16 /* Here are some trap goodies */ 17 18 /* Generic trap entry. */ 19 #define TRAP_ENTRY(type, label) \ 20 rd %psr, %l0; b label; rd %wim, %l3; nop; 21 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 C_LABEL(srmmu_fault); mov 1, %l7; 26 #define SRMMU_DFAULT rd %psr, %l0; rd %wim, %l3; b C_LABEL(srmmu_fault); mov 0, %l7; 27 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; 31 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; 35 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 ;-) 40 */ 41 42 /* Software trap for Linux system calls. */ 43 #define LINUX_SYSCALL_TRAP \ 44 sethi %hi(C_LABEL(sys_call_table)), %l7; \ 45 or %l7, %lo(C_LABEL(sys_call_table)), %l7; \ 46 b linux_sparc_syscall; \ 47 rd %psr, %l0; 48 49 /* Software trap for SunOS4.1.x system calls. */ 50 #define SUNOS_SYSCALL_TRAP \ 51 rd %psr, %l0; \ 52 sethi %hi(C_LABEL(sunos_sys_table)), %l7; \ 53 b linux_sparc_syscall; \ 54 or %l7, %lo(C_LABEL(sunos_sys_table)), %l7; 55 56 #define SUNOS_NO_SYSCALL_TRAP \ 57 b sunos_syscall; \ 58 rd %psr, %l0; \ 59 nop; \ 60 nop; 61 62 /* Software trap for Slowaris system calls. */ 63 #define SOLARIS_SYSCALL_TRAP \ 64 b solaris_syscall; \ 65 rd %psr, %l0; \ 66 nop; \ 67 nop; 68 69 #define INDIRECT_SOLARIS_SYSCALL(x) \ 70 mov x, %g1; \ 71 b solaris_syscall; \ 72 rd %psr, %l0; \ 73 nop; 74 75 #define BREAKPOINT_TRAP \ 76 b breakpoint_trap; \ 77 rd %psr,%l0; \ 78 nop; \ 79 nop; 80 81 /* Software trap for Sparc-netbsd system calls. */ 82 #define NETBSD_SYSCALL_TRAP \ 83 sethi %hi(C_LABEL(sys_call_table)), %l7; \ 84 or %l7, %lo(C_LABEL(sys_call_table)), %l7; \ 85 b bsd_syscall; \ 86 rd %psr, %l0; 87 88 /* The Get Condition Codes software trap for userland. */ 89 #define GETCC_TRAP \ 90 b getcc_trap_handler; mov %psr, %l0; nop; nop; 91 92 /* The Set Condition Codes software trap for userland. */ 93 #define SETCC_TRAP \ 94 b setcc_trap_handler; mov %psr, %l0; nop; nop; 95 96 /* The Get PSR software trap for userland. */ 97 #define GETPSR_TRAP \ 98 mov %psr, %i0; jmp %l2; rett %l2 + 4; nop; 99 100 /* This is for hard interrupts from level 1-14, 15 is non-maskable (nmi) and 101 * gets handled with another macro. 102 */ 103 #define TRAP_ENTRY_INTERRUPT(int_level) \ 104 mov int_level, %l7; rd %psr, %l0; b real_irq_entry; rd %wim, %l3; 105 106 /* NMI's (Non Maskable Interrupts) are special, you can't keep them 107 * from coming in, and basically if you get one, the shows over. ;( 108 * On the sun4c they are usually asynchronous memory errors, on the 109 * the sun4m they could be either due to mem errors or a software 110 * initiated interrupt from the prom/kern on an SMP box saying "I 111 * command you to do CPU tricks, read your mailbox for more info." 112 */ 113 #define NMI_TRAP \ 114 rd %wim, %l3; b linux_trap_nmi_sun4c; mov %psr, %l0; nop; 115 116 /* Window overflows/underflows are special and we need to try to be as 117 * efficient as possible here.... 118 */ 119 #define WINDOW_SPILL \ 120 rd %psr, %l0; rd %wim, %l3; b spill_window_entry; andcc %l0, PSR_PS, %g0; 121 122 #define WINDOW_FILL \ 123 rd %psr, %l0; rd %wim, %l3; b fill_window_entry; andcc %l0, PSR_PS, %g0; 124 125 #endif /* __SPARC_HEAD_H */ 126