x86/asm: Replace magic numbers in GDT descriptors, script-generated change

Actually replace the numeric values by the new symbolic values.

I used this to find all the existing users of the GDT_ENTRY*() macros:

  $ git grep -P 'GDT_ENTRY(_INIT)?\('

Some of the lines will exceed 80 characters, but some of them will be
shorter again in the next couple of patches.

Signed-off-by: Vegard Nossum <vegard.nossum@oracle.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
Link: https://lore.kernel.org/r/20231219151200.2878271-4-vegard.nossum@oracle.com

diff --git a/arch/x86/boot/pm.c b/arch/x86/boot/pm.c
index 0361b53..ab35b52 100644 (file)
--- a/arch/x86/boot/pm.c
+++ b/arch/x86/boot/pm.c
@@ -68,13 +68,13 @@ static void setup_gdt(void)
           being 8-byte unaligned.  Intel recommends 16 byte alignment. */
        static const u64 boot_gdt[] __attribute__((aligned(16))) = {
                /* CS: code, read/execute, 4 GB, base 0 */
-               [GDT_ENTRY_BOOT_CS] = GDT_ENTRY(0xc09b, 0, 0xfffff),
+               [GDT_ENTRY_BOOT_CS] = GDT_ENTRY(DESC_CODE32 | _DESC_ACCESSED, 0, 0xfffff),
                /* DS: data, read/write, 4 GB, base 0 */
-               [GDT_ENTRY_BOOT_DS] = GDT_ENTRY(0xc093, 0, 0xfffff),
+               [GDT_ENTRY_BOOT_DS] = GDT_ENTRY(DESC_DATA32 | _DESC_ACCESSED, 0, 0xfffff),
                /* TSS: 32-bit tss, 104 bytes, base 4096 */
                /* We only have a TSS here to keep Intel VT happy;
                   we don't actually use it for anything. */
-               [GDT_ENTRY_BOOT_TSS] = GDT_ENTRY(0x0089, 4096, 103),
+               [GDT_ENTRY_BOOT_TSS] = GDT_ENTRY(DESC_TSS32, 4096, 103),
        };
        /* Xen HVM incorrectly stores a pointer to the gdt_ptr, instead
           of the gdt_ptr contents.  Thus, make it static so it will

diff --git a/arch/x86/kernel/apm_32.c b/arch/x86/kernel/apm_32.c
index 5934ee5..76a5ced 100644 (file)
--- a/arch/x86/kernel/apm_32.c
+++ b/arch/x86/kernel/apm_32.c
@@ -420,7 +420,7 @@ static DEFINE_MUTEX(apm_mutex);
  * 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,
+static struct desc_struct bad_bios_desc = GDT_ENTRY_INIT(DESC_DATA32_BIOS,
                        (unsigned long)__va(0x400UL), PAGE_SIZE - 0x400 - 1);
 
 static const char driver_version[] = "1.16ac"; /* no spaces */

diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
index ceb6e4b..32934a0 100644 (file)
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -188,37 +188,37 @@ DEFINE_PER_CPU_PAGE_ALIGNED(struct gdt_page, gdt_page) = { .gdt = {
         * TLS descriptors are currently at a different place compared to i386.
         * Hopefully nobody expects them at a fixed place (Wine?)
         */
-       [GDT_ENTRY_KERNEL32_CS]         = GDT_ENTRY_INIT(0xc09b, 0, 0xfffff),
-       [GDT_ENTRY_KERNEL_CS]           = GDT_ENTRY_INIT(0xa09b, 0, 0xfffff),
-       [GDT_ENTRY_KERNEL_DS]           = GDT_ENTRY_INIT(0xc093, 0, 0xfffff),
-       [GDT_ENTRY_DEFAULT_USER32_CS]   = GDT_ENTRY_INIT(0xc0fb, 0, 0xfffff),
-       [GDT_ENTRY_DEFAULT_USER_DS]     = GDT_ENTRY_INIT(0xc0f3, 0, 0xfffff),
-       [GDT_ENTRY_DEFAULT_USER_CS]     = GDT_ENTRY_INIT(0xa0fb, 0, 0xfffff),
+       [GDT_ENTRY_KERNEL32_CS]         = GDT_ENTRY_INIT(DESC_CODE32 | _DESC_ACCESSED, 0, 0xfffff),
+       [GDT_ENTRY_KERNEL_CS]           = GDT_ENTRY_INIT(DESC_CODE64 | _DESC_ACCESSED, 0, 0xfffff),
+       [GDT_ENTRY_KERNEL_DS]           = GDT_ENTRY_INIT(DESC_DATA64 | _DESC_ACCESSED, 0, 0xfffff),
+       [GDT_ENTRY_DEFAULT_USER32_CS]   = GDT_ENTRY_INIT(DESC_CODE32 | DESC_USER | _DESC_ACCESSED, 0, 0xfffff),
+       [GDT_ENTRY_DEFAULT_USER_DS]     = GDT_ENTRY_INIT(DESC_DATA64 | DESC_USER | _DESC_ACCESSED, 0, 0xfffff),
+       [GDT_ENTRY_DEFAULT_USER_CS]     = GDT_ENTRY_INIT(DESC_CODE64 | DESC_USER | _DESC_ACCESSED, 0, 0xfffff),
 #else
-       [GDT_ENTRY_KERNEL_CS]           = GDT_ENTRY_INIT(0xc09a, 0, 0xfffff),
-       [GDT_ENTRY_KERNEL_DS]           = GDT_ENTRY_INIT(0xc092, 0, 0xfffff),
-       [GDT_ENTRY_DEFAULT_USER_CS]     = GDT_ENTRY_INIT(0xc0fa, 0, 0xfffff),
-       [GDT_ENTRY_DEFAULT_USER_DS]     = GDT_ENTRY_INIT(0xc0f2, 0, 0xfffff),
+       [GDT_ENTRY_KERNEL_CS]           = GDT_ENTRY_INIT(DESC_CODE32, 0, 0xfffff),
+       [GDT_ENTRY_KERNEL_DS]           = GDT_ENTRY_INIT(DESC_DATA32, 0, 0xfffff),
+       [GDT_ENTRY_DEFAULT_USER_CS]     = GDT_ENTRY_INIT(DESC_CODE32 | DESC_USER, 0, 0xfffff),
+       [GDT_ENTRY_DEFAULT_USER_DS]     = GDT_ENTRY_INIT(DESC_DATA32 | DESC_USER, 0, 0xfffff),
        /*
         * Segments used for calling PnP BIOS have byte granularity.
         * They code segments and data segments have fixed 64k limits,
         * the transfer segment sizes are set at run time.
         */
-       [GDT_ENTRY_PNPBIOS_CS32]        = GDT_ENTRY_INIT(0x409a, 0, 0xffff),
-       [GDT_ENTRY_PNPBIOS_CS16]        = GDT_ENTRY_INIT(0x009a, 0, 0xffff),
-       [GDT_ENTRY_PNPBIOS_DS]          = GDT_ENTRY_INIT(0x0092, 0, 0xffff),
-       [GDT_ENTRY_PNPBIOS_TS1]         = GDT_ENTRY_INIT(0x0092, 0, 0),
-       [GDT_ENTRY_PNPBIOS_TS2]         = GDT_ENTRY_INIT(0x0092, 0, 0),
+       [GDT_ENTRY_PNPBIOS_CS32]        = GDT_ENTRY_INIT(DESC_CODE32_BIOS, 0, 0xffff),
+       [GDT_ENTRY_PNPBIOS_CS16]        = GDT_ENTRY_INIT(DESC_CODE16, 0, 0xffff),
+       [GDT_ENTRY_PNPBIOS_DS]          = GDT_ENTRY_INIT(DESC_DATA16, 0, 0xffff),
+       [GDT_ENTRY_PNPBIOS_TS1]         = GDT_ENTRY_INIT(DESC_DATA16, 0, 0),
+       [GDT_ENTRY_PNPBIOS_TS2]         = GDT_ENTRY_INIT(DESC_DATA16, 0, 0),
        /*
         * The APM segments have byte granularity and their bases
         * are set at run time.  All have 64k limits.
         */
-       [GDT_ENTRY_APMBIOS_BASE]        = GDT_ENTRY_INIT(0x409a, 0, 0xffff),
-       [GDT_ENTRY_APMBIOS_BASE+1]      = GDT_ENTRY_INIT(0x009a, 0, 0xffff),
-       [GDT_ENTRY_APMBIOS_BASE+2]      = GDT_ENTRY_INIT(0x4092, 0, 0xffff),
+       [GDT_ENTRY_APMBIOS_BASE]        = GDT_ENTRY_INIT(DESC_CODE32_BIOS, 0, 0xffff),
+       [GDT_ENTRY_APMBIOS_BASE+1]      = GDT_ENTRY_INIT(DESC_CODE16, 0, 0xffff),
+       [GDT_ENTRY_APMBIOS_BASE+2]      = GDT_ENTRY_INIT(DESC_DATA32_BIOS, 0, 0xffff),
 
-       [GDT_ENTRY_ESPFIX_SS]           = GDT_ENTRY_INIT(0xc092, 0, 0xfffff),
-       [GDT_ENTRY_PERCPU]              = GDT_ENTRY_INIT(0xc092, 0, 0xfffff),
+       [GDT_ENTRY_ESPFIX_SS]           = GDT_ENTRY_INIT(DESC_DATA32, 0, 0xfffff),
+       [GDT_ENTRY_PERCPU]              = GDT_ENTRY_INIT(DESC_DATA32, 0, 0xfffff),
 #endif
 } };
 EXPORT_PER_CPU_SYMBOL_GPL(gdt_page);

diff --git a/arch/x86/kernel/head64.c b/arch/x86/kernel/head64.c
index 05a110c..00dbddf 100644 (file)
--- a/arch/x86/kernel/head64.c
+++ b/arch/x86/kernel/head64.c
@@ -71,9 +71,9 @@ EXPORT_SYMBOL(vmemmap_base);
  * GDT used on the boot CPU before switching to virtual addresses.
  */
 static struct desc_struct startup_gdt[GDT_ENTRIES] __initdata = {
-       [GDT_ENTRY_KERNEL32_CS]         = GDT_ENTRY_INIT(0xc09b, 0, 0xfffff),
-       [GDT_ENTRY_KERNEL_CS]           = GDT_ENTRY_INIT(0xa09b, 0, 0xfffff),
-       [GDT_ENTRY_KERNEL_DS]           = GDT_ENTRY_INIT(0xc093, 0, 0xfffff),
+       [GDT_ENTRY_KERNEL32_CS]         = GDT_ENTRY_INIT(DESC_CODE32 | _DESC_ACCESSED, 0, 0xfffff),
+       [GDT_ENTRY_KERNEL_CS]           = GDT_ENTRY_INIT(DESC_CODE64 | _DESC_ACCESSED, 0, 0xfffff),
+       [GDT_ENTRY_KERNEL_DS]           = GDT_ENTRY_INIT(DESC_DATA64 | _DESC_ACCESSED, 0, 0xfffff),
 };
 
 /*

diff --git a/arch/x86/kernel/setup_percpu.c b/arch/x86/kernel/setup_percpu.c
index 2c97bf7..f2583de 100644 (file)
--- a/arch/x86/kernel/setup_percpu.c
+++ b/arch/x86/kernel/setup_percpu.c
@@ -106,8 +106,8 @@ void __init pcpu_populate_pte(unsigned long addr)
 static inline void setup_percpu_segment(int cpu)
 {
 #ifdef CONFIG_X86_32
-       struct desc_struct d = GDT_ENTRY_INIT(0x8092, per_cpu_offset(cpu),
-                                             0xFFFFF);
+       struct desc_struct d = GDT_ENTRY_INIT(DESC_DATA32 & ~_DESC_DB,
+                                             per_cpu_offset(cpu), 0xFFFFF);
 
        write_gdt_entry(get_cpu_gdt_rw(cpu), GDT_ENTRY_PERCPU, &d, DESCTYPE_S);
 #endif

diff --git a/arch/x86/platform/pvh/head.S b/arch/x86/platform/pvh/head.S
index 9bcafdd..7c6a108 100644 (file)
--- a/arch/x86/platform/pvh/head.S
+++ b/arch/x86/platform/pvh/head.S
@@ -149,11 +149,11 @@ SYM_DATA_END(gdt)
 SYM_DATA_START_LOCAL(gdt_start)
        .quad 0x0000000000000000            /* NULL descriptor */
 #ifdef CONFIG_X86_64
-       .quad GDT_ENTRY(0xa09a, 0, 0xfffff) /* PVH_CS_SEL */
+       .quad GDT_ENTRY(DESC_CODE64, 0, 0xfffff) /* PVH_CS_SEL */
 #else
-       .quad GDT_ENTRY(0xc09a, 0, 0xfffff) /* PVH_CS_SEL */
+       .quad GDT_ENTRY(DESC_CODE32, 0, 0xfffff) /* PVH_CS_SEL */
 #endif
-       .quad GDT_ENTRY(0xc092, 0, 0xfffff) /* PVH_DS_SEL */
+       .quad GDT_ENTRY(DESC_DATA32, 0, 0xfffff) /* PVH_DS_SEL */
 SYM_DATA_END_LABEL(gdt_start, SYM_L_LOCAL, gdt_end)
 
        .balign 16

diff --git a/arch/x86/realmode/rm/reboot.S b/arch/x86/realmode/rm/reboot.S
index 4476418..5bc068b 100644 (file)
--- a/arch/x86/realmode/rm/reboot.S
+++ b/arch/x86/realmode/rm/reboot.S
@@ -154,5 +154,5 @@ SYM_DATA_START(machine_real_restart_gdt)
         * base value 0x100; since this is consistent with real mode
         * semantics we don't have to reload the segments once CR0.PE = 0.
         */
-       .quad   GDT_ENTRY(0x0093, 0x100, 0xffff)
+       .quad   GDT_ENTRY(DESC_DATA16 | _DESC_ACCESSED, 0x100, 0xffff)
 SYM_DATA_END(machine_real_restart_gdt)

diff --git a/drivers/firmware/efi/libstub/x86-5lvl.c b/drivers/firmware/efi/libstub/x86-5lvl.c
index 479dd44..005dd9b 100644 (file)
--- a/drivers/firmware/efi/libstub/x86-5lvl.c
+++ b/drivers/firmware/efi/libstub/x86-5lvl.c
@@ -13,8 +13,8 @@ bool efi_no5lvl;
 static void (*la57_toggle)(void *cr3);
 
 static const struct desc_struct gdt[] = {
-       [GDT_ENTRY_KERNEL32_CS] = GDT_ENTRY_INIT(0xc09b, 0, 0xfffff),
-       [GDT_ENTRY_KERNEL_CS]   = GDT_ENTRY_INIT(0xa09b, 0, 0xfffff),
+       [GDT_ENTRY_KERNEL32_CS] = GDT_ENTRY_INIT(DESC_CODE32 | _DESC_ACCESSED, 0, 0xfffff),
+       [GDT_ENTRY_KERNEL_CS]   = GDT_ENTRY_INIT(DESC_CODE64 | _DESC_ACCESSED, 0, 0xfffff),
 };
 
 /*

diff --git a/drivers/pnp/pnpbios/bioscalls.c b/drivers/pnp/pnpbios/bioscalls.c
index ddc6f21..1f31dce 100644 (file)
--- a/drivers/pnp/pnpbios/bioscalls.c
+++ b/drivers/pnp/pnpbios/bioscalls.c
@@ -60,7 +60,7 @@ do { \
        set_desc_limit(&gdt[(selname) >> 3], (size) - 1); \
 } while(0)
 
-static struct desc_struct bad_bios_desc = GDT_ENTRY_INIT(0x4092,
+static struct desc_struct bad_bios_desc = GDT_ENTRY_INIT(DESC_DATA32_BIOS,
                        (unsigned long)__va(0x400UL), PAGE_SIZE - 0x400 - 1);
 
 /*