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 */ 103