execkern.S revision 1.2
1 1.1 itohy | 2 1.1 itohy | execute NetBSD kernel 3 1.1 itohy | 4 1.1 itohy | written by Yasha (ITOH Yasufumi) 5 1.1 itohy | public domain 6 1.1 itohy | 7 1.2 minoura | $NetBSD: execkern.S,v 1.2 2001/06/12 16:57:27 minoura Exp $ 8 1.1 itohy 9 1.1 itohy /* XXX this value is from <machine/exec_aout.h> */ 10 1.1 itohy #define __LDPGSZ 8192 11 1.1 itohy 12 1.1 itohy #define MFP 0x00E88000 /* MFP */ 13 1.1 itohy #define MFP_IERA (MFP+0x07) /* (B) interrupt enable reg A */ 14 1.1 itohy #define MFP_IERB (MFP+0x09) /* (B) interrupt enable reg B */ 15 1.1 itohy #define MFP_RSR (MFP+0x2B) /* (B) USART receiver status reg */ 16 1.1 itohy 17 1.1 itohy #ifndef SRAM_MEMSZ 18 1.1 itohy #define SRAM 0x00ED0000 /* SRAM start addr */ 19 1.1 itohy #define SRAM_MEMSZ (SRAM + 8) /* (L) size of main memory */ 20 1.1 itohy #endif 21 1.1 itohy 22 1.2 minoura | %a3+0 kernel image top address (a.out header is excluded) 23 1.2 minoura | %a3+4 load address 24 1.2 minoura | %a3+8 text size 25 1.2 minoura | %a3+12 data size 26 1.2 minoura | %a3+16 bss size 27 1.2 minoura | %a3+20 symbol size 28 1.2 minoura | %a3+24 (reserved) (%d5) 29 1.2 minoura | %a3+28 bootdev (%d6) 30 1.2 minoura | %a3+32 boothowto (%d7) 31 1.2 minoura | %a3+36 entry address (absolute address) 32 1.1 itohy 33 1.1 itohy #ifndef XK_NO_C_INTERFACE 34 1.1 itohy .text 35 1.1 itohy .even 36 1.2 minoura ENTRY_NOPROFILE(exec_kernel) 37 1.2 minoura addql #4,%sp 38 1.2 minoura moveal %sp@+,%a3 | struct execkern_arg * 39 1.1 itohy #endif 40 1.1 itohy 41 1.2 minoura moveal %a3@+,%a0 | image address 42 1.2 minoura moveal %a3@+,%a1 | load address 43 1.2 minoura movel %a1,%d3 44 1.1 itohy 45 1.1 itohy | 46 1.1 itohy | copy image 47 1.1 itohy | 48 1.1 itohy 49 1.1 itohy | copy text segment 50 1.2 minoura movel %a3@+,%d0 | text size 51 1.2 minoura movel %d0,%d1 52 1.1 itohy jbsr copy 53 1.1 itohy 54 1.1 itohy | clear gap between text and data 55 1.2 minoura negl %d1 56 1.2 minoura andil #__LDPGSZ-1,%d1 57 1.2 minoura movel %d1,%d0 | gap size between text and data 58 1.1 itohy jbsr clear 59 1.1 itohy 60 1.1 itohy | copy data segment 61 1.2 minoura movel %a3@+,%d0 | data size 62 1.1 itohy jbsr copy 63 1.1 itohy 64 1.1 itohy | clear bss 65 1.2 minoura movel %a3@+,%d0 | bss size 66 1.1 itohy jbsr clear 67 1.1 itohy 68 1.1 itohy | copy symbol table 69 1.2 minoura movel %a3@+,%d0 | symbol table size 70 1.2 minoura movel %d0,%a1@+ 71 1.1 itohy beqs Lnotable 72 1.1 itohy jbsr copy 73 1.1 itohy 74 1.1 itohy | copy string table size 75 1.2 minoura movel %a0@+,%d0 76 1.2 minoura movel %d0,%a1@+ 77 1.1 itohy beqs Lnotable 78 1.1 itohy 79 1.1 itohy | copy string table 80 1.2 minoura subql #4,%d0 | table size is already copied 81 1.1 itohy jbsr copy 82 1.1 itohy 83 1.1 itohy Lnotable: 84 1.1 itohy 85 1.1 itohy | stop MFP interrupts (for compatibility) 86 1.1 itohy clrb MFP_IERA 87 1.1 itohy clrb MFP_IERB 88 1.1 itohy clrb MFP_RSR 89 1.1 itohy 90 1.1 itohy | 91 1.1 itohy | execute kernel 92 1.1 itohy | start(load_addr, mem_max, kernel_end) 93 1.1 itohy | 94 1.2 minoura movel %a1,%d0 95 1.2 minoura addql #3,%d0 96 1.2 minoura andib #0xFC,%d0 97 1.2 minoura subl %d3,%d0 98 1.2 minoura movel %d0,%sp@- | arg #3 (kernel size) 99 1.2 minoura movel SRAM_MEMSZ,%sp@- | arg #2 (RAM size from SRAM) 100 1.2 minoura movel %d3,%sp@- | arg #1 (load address) 101 1.1 itohy 102 1.1 itohy #if 0 103 1.2 minoura movel %a3@+,%d5 | (reserved) 104 1.2 minoura movel %a3@+,%d6 | boot device 105 1.2 minoura movel %a3@+,%d7 | boot howto 106 1.1 itohy 107 1.2 minoura movel %a3@+,%a0 | entry address 108 1.1 itohy #else /* optimized */ 109 1.2 minoura moveml %a3@+,%d5-%d7/%a0 110 1.1 itohy #endif 111 1.1 itohy 112 1.1 itohy | clear unused registers 113 1.2 minoura moveq #0,%d0 114 1.2 minoura moveq #0,%d1 115 1.2 minoura moveq #0,%d2 116 1.2 minoura moveq #0,%d3 117 1.2 minoura moveq #0,%d4 118 1.2 minoura moveal %d0,%a1 119 1.2 minoura moveal %d0,%a2 120 1.2 minoura moveal %d0,%a3 121 1.2 minoura moveal %d0,%a4 122 1.2 minoura moveal %d0,%a5 123 1.2 minoura moveal %d0,%a6 124 1.1 itohy 125 1.2 minoura jsr %a0@ | execute NetBSD kernel 126 1.1 itohy | NOTREACHED 127 1.1 itohy 128 1.1 itohy | ??? returned from kernel -- issue software reset 129 1.2 minoura subal %a1,%a1 130 1.2 minoura moveml 0x00ff0000,#0x0101 | get RESET vectors (%d0: ssp, %a0: pc) 131 1.2 minoura moveml #0x0101,%a1@ | put them at 0x00000000 (for Xellent) 132 1.2 minoura .long 0x4E7B9801 | movec %a1,%vbr 133 1.2 minoura jmp %a0@ | go to reset address 134 1.1 itohy 135 1.1 itohy 136 1.1 itohy | 137 1.1 itohy | utility routines 138 1.1 itohy | 139 1.1 itohy 140 1.2 minoura | copy %d0 bytes from higher (%a0) to lower (%a1) address 141 1.2 minoura 1: moveb %a0@+,%a1@+ 142 1.2 minoura copy: subql #1,%d0 143 1.1 itohy bpls 1b 144 1.1 itohy rts 145 1.1 itohy 146 1.2 minoura | clear %d0 bytes at %a1 147 1.2 minoura | do nothing if %d0 is zero 148 1.2 minoura 1: clrb %a1@+ 149 1.2 minoura clear: subql #1,%d0 150 1.1 itohy bpls 1b 151 1.1 itohy rts 152
Indexes created Wed Oct 01 07:09:59 GMT 2025