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Annotation of qemu/roms/seabios/src/pnpbios.c, revision 1.1

1.1     ! root        1: // PNP BIOS calls
        !             2: //
        !             3: // Copyright (C) 2008  Kevin O'Connor <[email protected]>
        !             4: //
        !             5: // This file may be distributed under the terms of the GNU LGPLv3 license.
        !             6: 
        !             7: #include "util.h" // checksum
        !             8: #include "config.h" // BUILD_BIOS_ADDR
        !             9: #include "farptr.h" // SET_FARVAR
        !            10: 
        !            11: struct pnpheader {
        !            12:     u32 signature;
        !            13:     u8 version;
        !            14:     u8 length;
        !            15:     u16 control;
        !            16:     u8 checksum;
        !            17:     u32 eventloc;
        !            18:     u16 real_ip;
        !            19:     u16 real_cs;
        !            20:     u16 prot_ip;
        !            21:     u32 prot_base;
        !            22:     u32 oemid;
        !            23:     u16 real_ds;
        !            24:     u32 prot_database;
        !            25: } PACKED;
        !            26: 
        !            27: extern struct pnpheader PNPHEADER;
        !            28: extern char pnp_string[];
        !            29: 
        !            30: #if CONFIG_PNPBIOS
        !            31: struct pnpheader PNPHEADER __aligned(16) VAR16EXPORT = {
        !            32:     .signature = PNP_SIGNATURE,
        !            33:     .version = 0x10,
        !            34:     .length = sizeof(PNPHEADER),
        !            35:     .real_cs = SEG_BIOS,
        !            36:     .prot_base = BUILD_BIOS_ADDR,
        !            37:     .real_ds = SEG_BIOS,
        !            38:     .prot_database = BUILD_BIOS_ADDR,
        !            39: };
        !            40: #else
        !            41: // We need a copy of this string in the 0xf000 segment, but we are not
        !            42: // actually a PnP BIOS, so make sure it is *not* aligned, so OSes will
        !            43: // not see it if they scan.
        !            44: char pnp_string[] __aligned(2) VAR16VISIBLE = " $PnP";
        !            45: #endif
        !            46: 
        !            47: #define FUNCTION_NOT_SUPPORTED 0x82
        !            48: 
        !            49: // BBS - Get Version and Installation Check
        !            50: static u16
        !            51: handle_pnp60(u16 *args)
        !            52: {
        !            53:     u16 version_ptr = args[1];
        !            54:     u16 version_seg = args[2];
        !            55:     SET_FARVAR(version_seg, *(u16*)(version_ptr+0), 0x0101);
        !            56:     return 0;
        !            57: }
        !            58: 
        !            59: static u16
        !            60: handle_pnpXX(u16 *args)
        !            61: {
        !            62:     return FUNCTION_NOT_SUPPORTED;
        !            63: }
        !            64: 
        !            65: u16 VISIBLE16
        !            66: handle_pnp(u16 *args)
        !            67: {
        !            68:     if (! CONFIG_PNPBIOS)
        !            69:         return FUNCTION_NOT_SUPPORTED;
        !            70: 
        !            71:     u16 arg1 = args[0];
        !            72:     dprintf(DEBUG_HDL_pnp, "pnp call arg1=%x\n", arg1);
        !            73: 
        !            74:     switch (arg1) {
        !            75:     case 0x60: return handle_pnp60(args);
        !            76:     default:   return handle_pnpXX(args);
        !            77:     }
        !            78: }
        !            79: 
        !            80: u16
        !            81: get_pnp_offset()
        !            82: {
        !            83:     if (! CONFIG_PNPBIOS)
        !            84:         return (u32)pnp_string + 1 - BUILD_BIOS_ADDR;
        !            85:     return (u32)&PNPHEADER - BUILD_BIOS_ADDR;
        !            86: }
        !            87: 
        !            88: // romlayout.S
        !            89: extern void entry_pnp_real();
        !            90: extern void entry_pnp_prot();
        !            91: 
        !            92: void
        !            93: pnp_setup()
        !            94: {
        !            95:     if (! CONFIG_PNPBIOS)
        !            96:         return;
        !            97: 
        !            98:     dprintf(3, "init PNPBIOS table\n");
        !            99: 
        !           100:     PNPHEADER.real_ip = (u32)entry_pnp_real - BUILD_BIOS_ADDR;
        !           101:     PNPHEADER.prot_ip = (u32)entry_pnp_prot - BUILD_BIOS_ADDR;
        !           102:     PNPHEADER.checksum -= checksum(&PNPHEADER, sizeof(PNPHEADER));
        !           103: }

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