From 6880951cdaadf554a7536859f1a001bed9fd9c34 Mon Sep 17 00:00:00 2001 From: Shao Miller Date: Mon, 28 Jun 2010 02:40:12 -0400 Subject: chain.c32, libcom32: Move chs macros and chs typedef as disk_chs Moving portions of chain.c32 into libcom32. Signed-off-by: Shao Miller --- com32/include/syslinux/disk.h | 11 +++++++++++ 1 file changed, 11 insertions(+) (limited to 'com32/include') diff --git a/com32/include/syslinux/disk.h b/com32/include/syslinux/disk.h index e81bd3b7..d893d7f7 100644 --- a/com32/include/syslinux/disk.h +++ b/com32/include/syslinux/disk.h @@ -57,6 +57,17 @@ struct disk_ebios_dapa { uint64_t lba; }; +/** + * CHS (cylinder, head, sector) value extraction macros. + * Taken from WinVBlock. None expand to an lvalue. +*/ +#define chs_head(chs) chs[0] +#define chs_sector(chs) (chs[1] & 0x3F) +#define chs_cyl_high(chs) (((uint16_t)(chs[1] & 0xC0)) << 2) +#define chs_cyl_low(chs) ((uint16_t)chs[2]) +#define chs_cylinder(chs) (chs_cyl_high(chs) | chs_cyl_low(chs)) +typedef uint8_t disk_chs[3]; + extern int disk_int13_retry(const com32sys_t * inreg, com32sys_t * outreg); extern int disk_get_params(int disk, struct disk_info *const diskinfo); extern void *disk_read_sectors(const struct disk_info *const diskinfo, -- cgit v1.2.1