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| author | Akinobu Mita <akinobu.mita@gmail.com> | 2009-08-09 17:03:52 +0900 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-08-10 11:10:52 +0200 |
| commit | c7425314c755d5f94da7c978205c85a7c6201212 (patch) | |
| tree | ef0e1152756a6e113a6d6b0cebc53b263eb78974 | |
| parent | 4c711576b90cc36c13b94816a953a8de6a53d03c (diff) | |
| download | op-kernel-dev-c7425314c755d5f94da7c978205c85a7c6201212.zip op-kernel-dev-c7425314c755d5f94da7c978205c85a7c6201212.tar.gz | |
x86: Introduce GDT_ENTRY_INIT(), initialize bad_bios_desc statically
Fully initialize bad_bios_desc statically instead of doing some
fields statically and some dynamically.
Suggested-by: "H. Peter Anvin" <hpa@zytor.com>
Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
LKML-Reference: <20090809080350.GA4765@localhost.localdomain>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
| -rw-r--r-- | arch/x86/kernel/apm_32.c | 19 | ||||
| -rw-r--r-- | drivers/pnp/pnpbios/bioscalls.c | 5 |
2 files changed, 11 insertions, 13 deletions
diff --git a/arch/x86/kernel/apm_32.c b/arch/x86/kernel/apm_32.c index febb2da..39a4462 100644 --- a/arch/x86/kernel/apm_32.c +++ b/arch/x86/kernel/apm_32.c @@ -403,7 +403,15 @@ static DECLARE_WAIT_QUEUE_HEAD(apm_waitqueue); static DECLARE_WAIT_QUEUE_HEAD(apm_suspend_waitqueue); static struct apm_user *user_list; static DEFINE_SPINLOCK(user_list_lock); -static struct desc_struct bad_bios_desc = GDT_ENTRY_INIT(0x4092, 0, 0); + +/* + * Set up a segment that references the real mode segment 0x40 + * that extends up to the end of page zero (that we have reserved). + * This is for buggy BIOS's that refer to (real mode) segment 0x40 + * even though they are called in protected mode. + */ +static struct desc_struct bad_bios_desc = GDT_ENTRY_INIT(0x4092, + (unsigned long)__va(0x400UL), PAGE_SIZE - 0x400 - 1); static const char driver_version[] = "1.16ac"; /* no spaces */ @@ -2332,15 +2340,6 @@ static int __init apm_init(void) pm_flags |= PM_APM; /* - * Set up a segment that references the real mode segment 0x40 - * that extends up to the end of page zero (that we have reserved). - * This is for buggy BIOS's that refer to (real mode) segment 0x40 - * even though they are called in protected mode. - */ - set_desc_base(&bad_bios_desc, (unsigned long)__va(0x40UL << 4)); - set_desc_limit(&bad_bios_desc, 4095 - (0x40 << 4)); - - /* * Set up the long jump entry point to the APM BIOS, which is called * from inline assembly. */ diff --git a/drivers/pnp/pnpbios/bioscalls.c b/drivers/pnp/pnpbios/bioscalls.c index bd035e3..fc83783c 100644 --- a/drivers/pnp/pnpbios/bioscalls.c +++ b/drivers/pnp/pnpbios/bioscalls.c @@ -60,7 +60,8 @@ do { \ set_desc_limit(&gdt[(selname) >> 3], (size) - 1); \ } while(0) -static struct desc_struct bad_bios_desc = GDT_ENTRY_INIT(0x4092, 0, 0); +static struct desc_struct bad_bios_desc = GDT_ENTRY_INIT(0x4092, + (unsigned long)__va(0x400UL), PAGE_SIZE - 0x400 - 1); /* * At some point we want to use this stack frame pointer to unwind @@ -476,8 +477,6 @@ void pnpbios_calls_init(union pnp_bios_install_struct *header) pnp_bios_callpoint.offset = header->fields.pm16offset; pnp_bios_callpoint.segment = PNP_CS16; - set_desc_base(&bad_bios_desc, (unsigned long)__va(0x40UL << 4)); - set_desc_limit(&bad_bios_desc, 4095 - (0x40 << 4)); for_each_possible_cpu(i) { struct desc_struct *gdt = get_cpu_gdt_table(i); if (!gdt) |
