diff options
Diffstat (limited to 'arch/x86/xen/xen-pvh.S')
| -rw-r--r-- | arch/x86/xen/xen-pvh.S | 177 |
1 files changed, 0 insertions, 177 deletions
diff --git a/arch/x86/xen/xen-pvh.S b/arch/x86/xen/xen-pvh.S deleted file mode 100644 index 1f8825bbaffb..000000000000 --- a/arch/x86/xen/xen-pvh.S +++ /dev/null @@ -1,177 +0,0 @@ -/* SPDX-License-Identifier: GPL-2.0 */ - -/* - * Copyright C 2016, Oracle and/or its affiliates. All rights reserved. - */ - - .code32 - .text -#define _pa(x) ((x) - __START_KERNEL_map) - -#include <linux/elfnote.h> -#include <linux/init.h> -#include <linux/linkage.h> -#include <asm/segment.h> -#include <asm/asm.h> -#include <asm/boot.h> -#include <asm/processor-flags.h> -#include <asm/msr.h> -#include <xen/interface/elfnote.h> - - __HEAD - -/* - * Entry point for PVH guests. - * - * Xen ABI specifies the following register state when we come here: - * - * - `ebx`: contains the physical memory address where the loader has placed - * the boot start info structure. - * - `cr0`: bit 0 (PE) must be set. All the other writeable bits are cleared. - * - `cr4`: all bits are cleared. - * - `cs `: must be a 32-bit read/execute code segment with a base of ‘0’ - * and a limit of ‘0xFFFFFFFF’. The selector value is unspecified. - * - `ds`, `es`: must be a 32-bit read/write data segment with a base of - * ‘0’ and a limit of ‘0xFFFFFFFF’. The selector values are all - * unspecified. - * - `tr`: must be a 32-bit TSS (active) with a base of '0' and a limit - * of '0x67'. - * - `eflags`: bit 17 (VM) must be cleared. Bit 9 (IF) must be cleared. - * Bit 8 (TF) must be cleared. Other bits are all unspecified. - * - * All other processor registers and flag bits are unspecified. The OS is in - * charge of setting up it's own stack, GDT and IDT. - */ - -#define PVH_GDT_ENTRY_CS 1 -#define PVH_GDT_ENTRY_DS 2 -#define PVH_GDT_ENTRY_CANARY 3 -#define PVH_CS_SEL (PVH_GDT_ENTRY_CS * 8) -#define PVH_DS_SEL (PVH_GDT_ENTRY_DS * 8) -#define PVH_CANARY_SEL (PVH_GDT_ENTRY_CANARY * 8) - -ENTRY(pvh_start_xen) - cld - - lgdt (_pa(gdt)) - - mov $PVH_DS_SEL,%eax - mov %eax,%ds - mov %eax,%es - mov %eax,%ss - - /* Stash hvm_start_info. */ - mov $_pa(pvh_start_info), %edi - mov %ebx, %esi - mov _pa(pvh_start_info_sz), %ecx - shr $2,%ecx - rep - movsl - - mov $_pa(early_stack_end), %esp - - /* Enable PAE mode. */ - mov %cr4, %eax - orl $X86_CR4_PAE, %eax - mov %eax, %cr4 - -#ifdef CONFIG_X86_64 - /* Enable Long mode. */ - mov $MSR_EFER, %ecx - rdmsr - btsl $_EFER_LME, %eax - wrmsr - - /* Enable pre-constructed page tables. */ - mov $_pa(init_top_pgt), %eax - mov %eax, %cr3 - mov $(X86_CR0_PG | X86_CR0_PE), %eax - mov %eax, %cr0 - - /* Jump to 64-bit mode. */ - ljmp $PVH_CS_SEL, $_pa(1f) - - /* 64-bit entry point. */ - .code64 -1: - /* Set base address in stack canary descriptor. */ - mov $MSR_GS_BASE,%ecx - mov $_pa(canary), %eax - xor %edx, %edx - wrmsr - - call xen_prepare_pvh - - /* startup_64 expects boot_params in %rsi. */ - mov $_pa(pvh_bootparams), %rsi - mov $_pa(startup_64), %rax - jmp *%rax - -#else /* CONFIG_X86_64 */ - - /* Set base address in stack canary descriptor. */ - movl $_pa(gdt_start),%eax - movl $_pa(canary),%ecx - movw %cx, (PVH_GDT_ENTRY_CANARY * 8) + 2(%eax) - shrl $16, %ecx - movb %cl, (PVH_GDT_ENTRY_CANARY * 8) + 4(%eax) - movb %ch, (PVH_GDT_ENTRY_CANARY * 8) + 7(%eax) - - mov $PVH_CANARY_SEL,%eax - mov %eax,%gs - - call mk_early_pgtbl_32 - - mov $_pa(initial_page_table), %eax - mov %eax, %cr3 - - mov %cr0, %eax - or $(X86_CR0_PG | X86_CR0_PE), %eax - mov %eax, %cr0 - - ljmp $PVH_CS_SEL, $1f -1: - call xen_prepare_pvh - mov $_pa(pvh_bootparams), %esi - - /* startup_32 doesn't expect paging and PAE to be on. */ - ljmp $PVH_CS_SEL, $_pa(2f) -2: - mov %cr0, %eax - and $~X86_CR0_PG, %eax - mov %eax, %cr0 - mov %cr4, %eax - and $~X86_CR4_PAE, %eax - mov %eax, %cr4 - - ljmp $PVH_CS_SEL, $_pa(startup_32) -#endif -END(pvh_start_xen) - - .section ".init.data","aw" - .balign 8 -gdt: - .word gdt_end - gdt_start - .long _pa(gdt_start) - .word 0 -gdt_start: - .quad 0x0000000000000000 /* NULL descriptor */ -#ifdef CONFIG_X86_64 - .quad GDT_ENTRY(0xa09a, 0, 0xfffff) /* PVH_CS_SEL */ -#else - .quad GDT_ENTRY(0xc09a, 0, 0xfffff) /* PVH_CS_SEL */ -#endif - .quad GDT_ENTRY(0xc092, 0, 0xfffff) /* PVH_DS_SEL */ - .quad GDT_ENTRY(0x4090, 0, 0x18) /* PVH_CANARY_SEL */ -gdt_end: - - .balign 16 -canary: - .fill 48, 1, 0 - -early_stack: - .fill BOOT_STACK_SIZE, 1, 0 -early_stack_end: - - ELFNOTE(Xen, XEN_ELFNOTE_PHYS32_ENTRY, - _ASM_PTR (pvh_start_xen - __START_KERNEL_map)) |