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Differential D44451 Diff 136024 sys/amd64/amd64/xen-locore.S

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sys/amd64/amd64/xen-locore.S

Show First 20 Lines • Show All 55 Lines • ▼ Show 20 Lines.section __xen_guest
ELFNOTE(Xen, XEN_ELFNOTE_HV_START_LOW, .quad, HYPERVISOR_VIRT_START) ELFNOTE(Xen, XEN_ELFNOTE_HV_START_LOW, .quad, HYPERVISOR_VIRT_START)
ELFNOTE(Xen, XEN_ELFNOTE_FEATURES, .asciz, "writable_descriptor_tables|auto_translated_physmap|supervisor_mode_kernel|hvm_callback_vector") ELFNOTE(Xen, XEN_ELFNOTE_FEATURES, .asciz, "writable_descriptor_tables|auto_translated_physmap|supervisor_mode_kernel|hvm_callback_vector")
ELFNOTE(Xen, XEN_ELFNOTE_PAE_MODE, .asciz, "yes") ELFNOTE(Xen, XEN_ELFNOTE_PAE_MODE, .asciz, "yes")
ELFNOTE(Xen, XEN_ELFNOTE_L1_MFN_VALID, .long, PG_V, PG_V) ELFNOTE(Xen, XEN_ELFNOTE_L1_MFN_VALID, .long, PG_V, PG_V)
ELFNOTE(Xen, XEN_ELFNOTE_LOADER, .asciz, "generic") ELFNOTE(Xen, XEN_ELFNOTE_LOADER, .asciz, "generic")
ELFNOTE(Xen, XEN_ELFNOTE_SUSPEND_CANCEL, .long, 0) ELFNOTE(Xen, XEN_ELFNOTE_SUSPEND_CANCEL, .long, 0)
ELFNOTE(Xen, XEN_ELFNOTE_BSD_SYMTAB, .asciz, "yes") ELFNOTE(Xen, XEN_ELFNOTE_BSD_SYMTAB, .asciz, "yes")
/* For PVHv2 support. */ /* For PVHv2 support. */
ELFNOTE(Xen, XEN_ELFNOTE_PHYS32_ENTRY, .long, VTOP(xen_start32)) ELFNOTE(Xen, XEN_ELFNOTE_PHYS32_ENTRY, .long, xen_start32)
.text .text
.p2align PAGE_SHIFT, 0x90 /* Hypercall_page needs to be PAGE aligned */ .p2align PAGE_SHIFT, 0x90 /* Hypercall_page needs to be PAGE aligned */
ENTRY(hypercall_page) ENTRY(hypercall_page)
.skip 0x1000, 0xcc /* Fill with `int3` to generate a #BP trap. */ .skip 0x1000, 0xcc /* Fill with `int3` to generate a #BP trap. */
/* PVH entry point. */ /* PVH entry point. */
.code32 .code32
.pushsection .text.init32
ENTRY(xen_start32) ENTRY(xen_start32)
/* Load flat GDT */ /* Load flat GDT */
movl $VTOP(gdtdesc32), %eax movl $gdt32desc, %eax
lgdt (%eax) lgdt (%eax)
jmp $GDT_CODE, $VTOP(reload_cs) jmp $GDT_CODE, $reload_cs
reload_cs: reload_cs:
movw $GDT_DATA, %ax movw $GDT_DATA, %ax
movw %ax, %ds movw %ax, %ds
movw %ax, %es movw %ax, %es
movw %ax, %ss movw %ax, %ss
movl $VTOP(bootstack), %esp movl $VTOP(bootstack), %esp
/* Don't trust what the loader gives for eflags. */ /* Don't trust what the loader gives for eflags. */
pushl $PSL_KERNEL pushl $PSL_KERNEL
popfl popfl
/*
* Create the page tables.
* The first 1GB is mapped using 2MB entries.
*/
movl $0, %eax
pgbuild:
cmp $(PAGE_SIZE/ENTRY_SIZE), %eax
jae pgbuild_done
/* PT4[i] = VTOP(&PT3[0]) | PG_V | PG_RW | PG_U */
movl $VTOP(PT4), %ecx
movl $VTOP(PT3), %edx
orl $(PG_V | PG_RW | PG_U), %edx
movl %edx, (%ecx,%eax,ENTRY_SIZE)
/* PT3[i] = VTOP(&PT2[0]) | PG_V | PG_RW | PG_U */
movl $VTOP(PT3), %ecx
movl $VTOP(PT2), %edx
orl $(PG_V | PG_RW | PG_U), %edx
movl %edx, (%ecx,%eax,ENTRY_SIZE)
/* PT2[i] = i * 2MiB | PG_V | PG_RW | PG_PS | PG_U */
movl $VTOP(PT2), %ecx
movl %eax, %edx
shll $PDRSHIFT, %edx
orl $(PG_V | PG_RW | PG_PS | PG_U), %edx
movl %edx, (%ecx,%eax,ENTRY_SIZE)
inc %eax
jmp pgbuild
pgbuild_done:
/* Turn on EFER.LME */ /* Turn on EFER.LME */
movl $MSR_EFER, %ecx movl $MSR_EFER, %ecx
rdmsr rdmsr
orl $EFER_LME, %eax orl $EFER_LME, %eax
wrmsr wrmsr
/* Turn on PAE */ /* Turn on PAE */
movl %cr4, %eax movl %cr4, %eax
orl $CR4_PAE, %eax orl $CR4_PAE, %eax
movl %eax, %cr4 movl %eax, %cr4
/* Set %cr3 for PT4 */ /* Set %cr3 for PT4 */
movl $VTOP(PT4), %eax call xen_start_pgtable
movl %eax, %cr3 movl %eax, %cr3
/* Turn on paging (implicitly sets EFER.LMA) */ /* Turn on paging (implicitly sets EFER.LMA) */
movl %cr0, %eax movl %cr0, %eax
orl $CR0_PG, %eax orl $CR0_PG, %eax
movl %eax, %cr0 movl %eax, %cr0
/* Now we're in compatibility mode. Set %cs for long mode */ /* Now we're in compatibility mode. Set %cs for long mode */
movl $VTOP(gdtdesc), %eax movl $gdt64desc, %eax
lgdt (%eax) lgdt (%eax)
ljmp $GDT_CODE, $VTOP(longmode) ljmp $GDT_CODE, $longmode
.code64 .code64
longmode: longmode:
/* We're still running V=P, jump to entry point */ /* We're still running V=P, jump to entry point */
movq $bootstack, %rsp movq $bootstack, %rsp
movq $start_kernel, %rax movq $start_kernel, %rax
pushq %rax pushq %rax
ret ret
.popsection
start_kernel: start_kernel:
/* /*
* Pass %ebx as the argument to hammer_time_xen, it contains * Pass %ebx as the argument to hammer_time_xen, it contains
* the startup info. * the startup info.
*/ */
movq %rbx, %rdi movq %rbx, %rdi
call hammer_time_xen call hammer_time_xen
movq %rax, %rsp movq %rax, %rsp
call mi_startup call mi_startup
/* NOTREACHED */ /* NOTREACHED */
0: hlt 0: hlt
jmp 0b jmp 0b
/* Space for initial page tables */
.data
.p2align 12,0x40
PT4:
.space 0x1000
PT3:
.space 0x1000
PT2:
.space 0x1000
/* 64bit GDT */
gdtdesc:
.word gdtend - gdt - 1
.long VTOP(gdt) # low
.long 0 # high
gdt:
.long 0 # null descriptor
.long 0
.long 0x00000000 # %cs
.long 0x00209800
.long 0x00000000 # %ds
.long 0x00008000
gdtend:
/* 32bit GDT */
gdtdesc32:
.word gdt32end - gdt32 - 1
.long VTOP(gdt32)
.long 0
gdt32:
.long 0 # null descriptor
.long 0
.long 0x0000ffff # %cs
.long 0x00cf9a00
.long 0x0000ffff # %ds, %es, %ss
.long 0x00cf9200
gdt32end: