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x86: add GDT descriptors for user mode

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These are arranged in the particular order required
by the syscall/sysret instructions.

Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
This commit is contained in:
Andrew Boie 2019-11-13 10:42:05 -08:00 • committed by Anas Nashif
commit ded0185eb8
2 changed files with 14 additions and 8 deletions
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11
include/arch/x86/intel64/thread.h
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@ -16,11 +16,14 @@
#define X86_KERNEL_DS_32 0x10 /* 32-bit kernel data */
#define X86_KERNEL_CS 0x18 /* 64-bit kernel code */
#define X86_KERNEL_DS 0x20 /* 64-bit kernel data */
#define X86_USER_CS_32 0x28 /* 32-bit user data (unused) */
#define X86_USER_DS 0x30 /* 64-bit user mode data */
#define X86_USER_CS 0x38 /* 64-bit user mode code */
#define X86_KERNEL_CPU0_TR 0x28 /* 64-bit task state segment */
#define X86_KERNEL_CPU1_TR 0x38 /* 64-bit task state segment */
#define X86_KERNEL_CPU2_TR 0x48 /* 64-bit task state segment */
#define X86_KERNEL_CPU3_TR 0x58 /* 64-bit task state segment */
#define X86_KERNEL_CPU0_TR 0x40 /* 64-bit task state segment */
#define X86_KERNEL_CPU1_TR 0x50 /* 64-bit task state segment */
#define X86_KERNEL_CPU2_TR 0x60 /* 64-bit task state segment */
#define X86_KERNEL_CPU3_TR 0x70 /* 64-bit task state segment */
/*
* Some SSE definitions. Ideally these will ultimately be shared with 32-bit.