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| author | kib <kib@FreeBSD.org> | 2010-06-05 15:59:59 +0000 |
|---|---|---|
| committer | kib <kib@FreeBSD.org> | 2010-06-05 15:59:59 +0000 |
| commit | 2d77212fe48ecc0a97a3c56ca4cb8dc37493a066 (patch) | |
| tree | bcc333531405cbc8269cbb94116e1781440b2ed4 /sys/amd64/include/pcb.h | |
| parent | fbdcfea8cb5a809b733223e1c53a383040e1dc4b (diff) | |
| download | FreeBSD-src-2d77212fe48ecc0a97a3c56ca4cb8dc37493a066.zip FreeBSD-src-2d77212fe48ecc0a97a3c56ca4cb8dc37493a066.tar.gz | |
Introduce the x86 kernel interfaces to allow kernel code to use
FPU/SSE hardware. Caller should provide a save area that is chained
into the stack of the areas; pcb save_area for usermode FPU state is
on top. The pcb now contains a pointer to the current FPU saved area,
used during FPUDNA handling and context switches. There is also a
facility to allow the kernel thread to use pcb save_area.
Change the dreaded warnings "npxdna in kernel mode!" into the panics
when FPU usage is not registered.
KPI discussed with: fabient
Tested by: pho, fabient
Hardware provided by: Sentex Communications
MFC after: 1 month
Diffstat (limited to 'sys/amd64/include/pcb.h')
| -rw-r--r-- | sys/amd64/include/pcb.h | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/sys/amd64/include/pcb.h b/sys/amd64/include/pcb.h index b26188a..aead8b7 100644 --- a/sys/amd64/include/pcb.h +++ b/sys/amd64/include/pcb.h @@ -57,7 +57,9 @@ struct pcb { register_t pcb_gsbase; u_long pcb_flags; #define PCB_DBREGS 0x02 /* process using debug registers */ +#define PCB_KERNFPU 0x04 /* kernel uses fpu */ #define PCB_FPUINITDONE 0x08 /* fpu state is initialized */ +#define PCB_USERFPUINITDONE 0x10 /* fpu user state is initialized */ #define PCB_GS32BIT 0x20 /* linux gs switch */ #define PCB_32BIT 0x40 /* process has 32 bit context (segs etc) */ #define PCB_FULLCTX 0x80 /* full context restore on sysret */ @@ -69,7 +71,7 @@ struct pcb { u_int64_t pcb_dr6; u_int64_t pcb_dr7; - struct savefpu pcb_save; + struct savefpu pcb_user_save; uint16_t pcb_initial_fpucw; caddr_t pcb_onfault; /* copyin/out fault recovery */ @@ -78,6 +80,7 @@ struct pcb { struct user_segment_descriptor pcb_gs32sd; /* local tss, with i/o bitmap; NULL for common */ struct amd64tss *pcb_tssp; + struct savefpu *pcb_save; char pcb_full_iret; }; |
