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| author | Simon Rettberg | 2021-03-08 15:55:33 +0100 |
|---|---|---|
| committer | Simon Rettberg | 2021-03-08 15:55:33 +0100 |
| commit | 6707d9218c8e6e760e53068d5f41ceb31fac6ea0 (patch) | |
| tree | 88e8fc84ede2a0ed2c1cec3a6109beb9fb53abf5 /src/arch/x86/transitions/librm.S | |
| parent | Merge branch 'master' into openslx (diff) | |
| parent | [linux] Do not assume that stat() works on sysfs files (diff) | |
| download | ipxe-6707d9218c8e6e760e53068d5f41ceb31fac6ea0.tar.gz ipxe-6707d9218c8e6e760e53068d5f41ceb31fac6ea0.tar.xz ipxe-6707d9218c8e6e760e53068d5f41ceb31fac6ea0.zip | |
Merge branch 'master' into openslx
Diffstat (limited to 'src/arch/x86/transitions/librm.S')
| -rw-r--r-- | src/arch/x86/transitions/librm.S | 29 |
1 files changed, 20 insertions, 9 deletions
diff --git a/src/arch/x86/transitions/librm.S b/src/arch/x86/transitions/librm.S index 9d3eff954..5dacb9b04 100644 --- a/src/arch/x86/transitions/librm.S +++ b/src/arch/x86/transitions/librm.S @@ -99,7 +99,7 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL ) **************************************************************************** */ .section ".data16.gdt", "aw", @progbits - .align 16 + .balign 16 gdt: gdtr: /* The first GDT entry is unused, the GDTR can fit here. */ gdt_limit: .word gdt_length - 1 @@ -210,9 +210,7 @@ VC_TMP_CR3: .space 4 VC_TMP_CR4: .space 4 VC_TMP_EMER: .space 8 .endif -#ifdef TIVOLI_VMM_WORKAROUND VC_TMP_FXSAVE: .space 512 -#endif VC_TMP_END: .previous @@ -224,7 +222,7 @@ RC_TMP_END: /* Shared temporary static buffer */ .section ".bss16.rm_tmpbuf", "aw", @nobits - .align 16 + .balign 16 rm_tmpbuf: .space VC_TMP_END .size rm_tmpbuf, . - rm_tmpbuf @@ -350,6 +348,13 @@ init_librm_rmode: /* Initialise IDT */ virtcall init_idt +#ifdef TIVOLI_VMM_WORKAROUND + /* Check for FXSAVE/FXRSTOR */ + clc + virtcall check_fxsr + setnc fxsr_supported +#endif + /* Restore registers */ popl %edi popl %ebx @@ -366,6 +371,10 @@ set_seg_base: roll $16, %eax ret + .section ".data16.fxsr_supported", "awx", @progbits +fxsr_supported: /* FXSAVE/FXRSTOR instructions supported */ + .byte 0 + /**************************************************************************** * real_to_prot (real-mode near call, 32-bit virtual return address) * @@ -1007,10 +1016,11 @@ virt_call: cli movw %cs:rm_ds, %ds -#ifdef TIVOLI_VMM_WORKAROUND /* Preserve FPU, MMX and SSE state in temporary static buffer */ + testb $0xff, fxsr_supported + jz 1f fxsave ( rm_tmpbuf + VC_TMP_FXSAVE ) -#endif +1: /* Preserve GDT and IDT in temporary static buffer */ sidt ( rm_tmpbuf + VC_TMP_IDT ) sgdt ( rm_tmpbuf + VC_TMP_GDT ) @@ -1077,10 +1087,11 @@ vc_rmode: wrmsr .endif -#ifdef TIVOLI_VMM_WORKAROUND /* Restore FPU, MMX and SSE state from temporary static buffer */ + testb $0xff, fxsr_supported + jz 1f fxrstor ( rm_tmpbuf + VC_TMP_FXSAVE ) -#endif +1: /* Restore registers and flags and return */ popl %eax /* skip %cs and %ss */ popw %ds @@ -1470,7 +1481,7 @@ interrupt_wrapper: **************************************************************************** */ .section ".pages", "aw", @nobits - .align SIZEOF_PT + .balign SIZEOF_PT /* Page map level 4 entries (PML4Es) * |