d/freebsd-skq
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Use symbolic names for int13 calls

Browse Source 
For all the INT13 calls, use symbolic names instead of magic numbers. This makes
it easier to understand what the code is doing w/o a trip to google to find what
these numbers mean.
This commit is contained in:
Warner Losh 2019-12-16 21:52:12 +00:00
parent 2e1d04ae9b
commit 7f5499972e
2 changed files with 43 additions and 25 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
stand/i386/common/edd.h
View File

@ -107,4 +107,7 @@ struct edd_params_v4 {
#define EDD_DEVICE_PATH_KEY 0xbedd #define EDD_DEVICE_PATH_KEY 0xbedd
#define EDD_QUERY_MAGIC 0x55aa
#define EDD_INSTALLED 0xaa55
#endif /* !_EDD_H_ */ #endif /* !_EDD_H_ */

65
stand/i386/libi386/biosdisk.c
View File

@ -64,6 +64,22 @@ __FBSDID("$FreeBSD$");
#define ACDMAJOR 117 #define ACDMAJOR 117
#define CDMAJOR 15 #define CDMAJOR 15
/*
* INT13 commands
*/
#define CMD_RESET 0x0000
#define CMD_READ_CHS 0x0200
#define CMD_WRITE_CHS 0x0300
#define CMD_READ_PARAM 0x0800
#define CMD_DRIVE_TYPE 0x1500
#define CMD_CHECK_EDD 0x4100
#define CMD_READ_LBA 0x4200
#define CMD_WRITE_LBA 0x4300
#define CMD_EXT_PARAM 0x4800
#define CMD_CD_GET_STATUS 0x4b01
#define DISK_BIOS 0x13
#ifdef DISK_DEBUG #ifdef DISK_DEBUG
#define DPRINTF(fmt, args...) printf("%s: " fmt "\n", __func__, ## args) #define DPRINTF(fmt, args...) printf("%s: " fmt "\n", __func__, ## args)
#else #else
@ -265,8 +281,8 @@ fd_count(void)
bd_reset_disk(drive); bd_reset_disk(drive);
v86.ctl = V86_FLAGS; v86.ctl = V86_FLAGS;
v86.addr = 0x13; v86.addr = DISK_BIOS;
v86.eax = 0x1500; v86.eax = CMD_DRIVE_TYPE;
v86.edx = drive; v86.edx = drive;
v86int(); v86int();
@ -367,8 +383,8 @@ bc_add(int biosdev)
return (-1); return (-1);
v86.ctl = V86_FLAGS; v86.ctl = V86_FLAGS;
v86.addr = 0x13; v86.addr = DISK_BIOS;
v86.eax = 0x4b01; v86.eax = CMD_CD_GET_STATUS;
v86.edx = biosdev; v86.edx = biosdev;
v86.ds = VTOPSEG(&bc_sp); v86.ds = VTOPSEG(&bc_sp);
v86.esi = VTOPOFF(&bc_sp); v86.esi = VTOPOFF(&bc_sp);
@ -422,14 +438,14 @@ bd_check_extensions(int unit)
/* Determine if we can use EDD with this device. */ /* Determine if we can use EDD with this device. */
v86.ctl = V86_FLAGS; v86.ctl = V86_FLAGS;
v86.addr = 0x13; v86.addr = DISK_BIOS;
v86.eax = 0x4100; v86.eax = CMD_CHECK_EDD;
v86.edx = unit; v86.edx = unit;
v86.ebx = 0x55aa; v86.ebx = EDD_QUERY_MAGIC;
v86int(); v86int();
if (V86_CY(v86.efl) || /* carry set */ if (V86_CY(v86.efl) || /* carry set */
(v86.ebx & 0xffff) != 0xaa55) /* signature */ (v86.ebx & 0xffff) != EDD_INSTALLED) /* signature */
return (0); return (0);
/* extended disk access functions (AH=42h-44h,47h,48h) supported */ /* extended disk access functions (AH=42h-44h,47h,48h) supported */
@ -444,8 +460,8 @@ bd_reset_disk(int unit)
{ {
/* reset disk */ /* reset disk */
v86.ctl = V86_FLAGS; v86.ctl = V86_FLAGS;
v86.addr = 0x13; v86.addr = DISK_BIOS;
v86.eax = 0; v86.eax = CMD_RESET;
v86.edx = unit; v86.edx = unit;
v86int(); v86int();
} }
@ -458,8 +474,8 @@ bd_get_diskinfo_std(struct bdinfo *bd)
{ {
bzero(&v86, sizeof(v86)); bzero(&v86, sizeof(v86));
v86.ctl = V86_FLAGS; v86.ctl = V86_FLAGS;
v86.addr = 0x13; v86.addr = DISK_BIOS;
v86.eax = 0x800; v86.eax = CMD_READ_PARAM;
v86.edx = bd->bd_unit; v86.edx = bd->bd_unit;
v86int(); v86int();
@ -493,8 +509,8 @@ bd_get_diskinfo_ext(struct bdinfo *bd)
bzero(&params, sizeof(params)); bzero(&params, sizeof(params));
params.len = sizeof(params); params.len = sizeof(params);
v86.ctl = V86_FLAGS; v86.ctl = V86_FLAGS;
v86.addr = 0x13; v86.addr = DISK_BIOS;
v86.eax = 0x4800; v86.eax = CMD_EXT_PARAM;
v86.edx = bd->bd_unit; v86.edx = bd->bd_unit;
v86.ds = VTOPSEG(&params); v86.ds = VTOPSEG(&params);
v86.esi = VTOPOFF(&params); v86.esi = VTOPOFF(&params);
@ -560,8 +576,8 @@ bd_int13probe(bdinfo_t *bd)
/* Get disk type */ /* Get disk type */
v86.ctl = V86_FLAGS; v86.ctl = V86_FLAGS;
v86.addr = 0x13; v86.addr = DISK_BIOS;
v86.eax = 0x1500; v86.eax = CMD_DRIVE_TYPE;
v86.edx = bd->bd_unit; v86.edx = bd->bd_unit;
v86int(); v86int();
if (V86_CY(v86.efl) || (v86.eax & 0x300) == 0) if (V86_CY(v86.efl) || (v86.eax & 0x300) == 0)
@ -1076,12 +1092,11 @@ bd_edd_io(bdinfo_t *bd, daddr_t dblk, int blks, caddr_t dest,
packet.seg = VTOPSEG(dest); packet.seg = VTOPSEG(dest);
packet.lba = dblk; packet.lba = dblk;
v86.ctl = V86_FLAGS; v86.ctl = V86_FLAGS;
v86.addr = 0x13; v86.addr = DISK_BIOS;
/* Should we Write with verify ?? 0x4302 ? */
if (dowrite == BD_WR) if (dowrite == BD_WR)
v86.eax = 0x4300; v86.eax = CMD_WRITE_LBA; /* maybe Write with verify 0x4302? */
else else
v86.eax = 0x4200; v86.eax = CMD_READ_LBA;
v86.edx = bd->bd_unit; v86.edx = bd->bd_unit;
v86.ds = VTOPSEG(&packet); v86.ds = VTOPSEG(&packet);
v86.esi = VTOPOFF(&packet); v86.esi = VTOPOFF(&packet);
@ -1113,11 +1128,11 @@ bd_chs_io(bdinfo_t *bd, daddr_t dblk, int blks, caddr_t dest,
} }
v86.ctl = V86_FLAGS; v86.ctl = V86_FLAGS;
v86.addr = 0x13; v86.addr = DISK_BIOS;
if (dowrite == BD_WR) if (dowrite == BD_WR)
v86.eax = 0x300 | blks; v86.eax = CMD_WRITE_CHS | blks;
else else
v86.eax = 0x200 | blks; v86.eax = CMD_READ_CHS | blks;
v86.ecx = ((cyl & 0xff) << 8) | ((cyl & 0x300) >> 2) | sec; v86.ecx = ((cyl & 0xff) << 8) | ((cyl & 0x300) >> 2) | sec;
v86.edx = (hd << 8) | bd->bd_unit; v86.edx = (hd << 8) | bd->bd_unit;
v86.es = VTOPSEG(dest); v86.es = VTOPSEG(dest);
@ -1222,8 +1237,8 @@ bd_getbigeom(int bunit)
{ {
v86.ctl = V86_FLAGS; v86.ctl = V86_FLAGS;
v86.addr = 0x13; v86.addr = DISK_BIOS;
v86.eax = 0x800; v86.eax = CMD_READ_PARAM;
v86.edx = 0x80 + bunit; v86.edx = 0x80 + bunit;
v86int(); v86int();
if (V86_CY(v86.efl)) if (V86_CY(v86.efl))