2d72cbec41
. add cpufeature detection of both . use it for both ipc and kernelcall traps, using a register for call number . SYSENTER/SYSCALL does not save any context, therefore userland has to save it . to accomodate multiple kernel entry/exit types, the entry type is recorded in the process struct. hitherto all types were interrupt (soft int, exception, hard int); now SYSENTER/SYSCALL is new, with the difference that context is not fully restored from proc struct when running the process again. this can't be done as some information is missing. . complication: cases in which the kernel has to fully change process context (i.e. sigreturn). in that case the exit type is changed from SYSENTER/SYSEXIT to soft-int (i.e. iret) and context is fully restored from the proc struct. this does mean the PC and SP must change, as the sysenter/sysexit userland code will otherwise try to restore its own context. this is true in the sigreturn case. . override all usage by setting libc_ipc=1
31 lines
939 B
C
31 lines
939 B
C
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#ifndef _MINIX_CPUFEATURE_H
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#define _MINIX_CPUFEATURE_H 1
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#define _CPUF_I386_FPU 0 /* FPU-x87 FPU on Chip */
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#define _CPUF_I386_PSE 1 /* Page Size Extension */
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#define _CPUF_I386_PGE 2 /* Page Global Enable */
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#define _CPUF_I386_APIC_ON_CHIP 3 /* APIC is present on the chip */
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#define _CPUF_I386_TSC 4 /* Timestamp counter present */
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#define _CPUF_I386_SSE1234_12 5 /* Support for SSE/SSE2/SSE3/SSSE3/SSE4
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* Extensions and FXSR
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*/
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#define _CPUF_I386_FXSR 6
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#define _CPUF_I386_SSE 7
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#define _CPUF_I386_SSE2 8
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#define _CPUF_I386_SSE3 9
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#define _CPUF_I386_SSSE3 10
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#define _CPUF_I386_SSE4_1 11
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#define _CPUF_I386_SSE4_2 12
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#define _CPUF_I386_HTT 13 /* Supports HTT */
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#define _CPUF_I386_HTT_MAX_NUM 14 /* Maximal num of threads */
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#define _CPUF_I386_MTRR 15
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#define _CPUF_I386_SYSENTER 16 /* Intel SYSENTER instrs */
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#define _CPUF_I386_SYSCALL 17 /* AMD SYSCALL instrs */
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int _cpufeature(int featureno);
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#endif
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