diff options
author | John Snow <jsnow@redhat.com> | 2020-07-24 01:22:57 -0400 |
---|---|---|
committer | John Snow <jsnow@redhat.com> | 2020-10-01 13:04:16 -0400 |
commit | 14ee9b53adc2f2e7f60f8ee0e906489785c8db13 (patch) | |
tree | a7322c7ab795bf2c9b35455122b63cf56a794215 /hw | |
parent | be8c9423dec7bd0a0af7f57ecbbcb2718db72555 (diff) | |
download | qemu-14ee9b53adc2f2e7f60f8ee0e906489785c8db13.zip qemu-14ee9b53adc2f2e7f60f8ee0e906489785c8db13.tar.gz qemu-14ee9b53adc2f2e7f60f8ee0e906489785c8db13.tar.bz2 |
ide: reorder set/get sector functions
Reorder these just a pinch to make them more obvious at a glance what
the addressing mode is.
Signed-off-by: John Snow <jsnow@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Diffstat (limited to 'hw')
-rw-r--r-- | hw/ide/core.c | 26 |
1 files changed, 15 insertions, 11 deletions
diff --git a/hw/ide/core.c b/hw/ide/core.c index 6ececa5..afff355 100644 --- a/hw/ide/core.c +++ b/hw/ide/core.c @@ -587,21 +587,23 @@ int64_t ide_get_sector(IDEState *s) { int64_t sector_num; if (s->select & 0x40) { - /* lba */ - if (!s->lba48) { - sector_num = ((s->select & 0x0f) << 24) | (s->hcyl << 16) | - (s->lcyl << 8) | s->sector; - } else { + if (s->lba48) { sector_num = ((int64_t)s->hob_hcyl << 40) | ((int64_t) s->hob_lcyl << 32) | ((int64_t) s->hob_sector << 24) | ((int64_t) s->hcyl << 16) | ((int64_t) s->lcyl << 8) | s->sector; + } else { + /* LBA28 */ + sector_num = ((s->select & 0x0f) << 24) | (s->hcyl << 16) | + (s->lcyl << 8) | s->sector; } } else { + /* CHS */ sector_num = ((s->hcyl << 8) | s->lcyl) * s->heads * s->sectors + (s->select & 0x0f) * s->sectors + (s->sector - 1); } + return sector_num; } @@ -609,20 +611,22 @@ void ide_set_sector(IDEState *s, int64_t sector_num) { unsigned int cyl, r; if (s->select & 0x40) { - if (!s->lba48) { - s->select = (s->select & 0xf0) | (sector_num >> 24); - s->hcyl = (sector_num >> 16); - s->lcyl = (sector_num >> 8); - s->sector = (sector_num); - } else { + if (s->lba48) { s->sector = sector_num; s->lcyl = sector_num >> 8; s->hcyl = sector_num >> 16; s->hob_sector = sector_num >> 24; s->hob_lcyl = sector_num >> 32; s->hob_hcyl = sector_num >> 40; + } else { + /* LBA28 */ + s->select = (s->select & 0xf0) | (sector_num >> 24); + s->hcyl = (sector_num >> 16); + s->lcyl = (sector_num >> 8); + s->sector = (sector_num); } } else { + /* CHS */ cyl = sector_num / (s->heads * s->sectors); r = sector_num % (s->heads * s->sectors); s->hcyl = cyl >> 8; |