18c2ecf20Sopenharmony_ci/* SPDX-License-Identifier: GPL-2.0 */ 28c2ecf20Sopenharmony_ci#include <linux/linkage.h> 38c2ecf20Sopenharmony_ci#include <linux/errno.h> 48c2ecf20Sopenharmony_ci#include <asm/asm.h> 58c2ecf20Sopenharmony_ci#include <asm/msr.h> 68c2ecf20Sopenharmony_ci 78c2ecf20Sopenharmony_ci#ifdef CONFIG_X86_64 88c2ecf20Sopenharmony_ci/* 98c2ecf20Sopenharmony_ci * int {rdmsr,wrmsr}_safe_regs(u32 gprs[8]); 108c2ecf20Sopenharmony_ci * 118c2ecf20Sopenharmony_ci * reg layout: u32 gprs[eax, ecx, edx, ebx, esp, ebp, esi, edi] 128c2ecf20Sopenharmony_ci * 138c2ecf20Sopenharmony_ci */ 148c2ecf20Sopenharmony_ci.macro op_safe_regs op 158c2ecf20Sopenharmony_ciSYM_FUNC_START(\op\()_safe_regs) 168c2ecf20Sopenharmony_ci pushq %rbx 178c2ecf20Sopenharmony_ci pushq %r12 188c2ecf20Sopenharmony_ci movq %rdi, %r10 /* Save pointer */ 198c2ecf20Sopenharmony_ci xorl %r11d, %r11d /* Return value */ 208c2ecf20Sopenharmony_ci movl (%rdi), %eax 218c2ecf20Sopenharmony_ci movl 4(%rdi), %ecx 228c2ecf20Sopenharmony_ci movl 8(%rdi), %edx 238c2ecf20Sopenharmony_ci movl 12(%rdi), %ebx 248c2ecf20Sopenharmony_ci movl 20(%rdi), %r12d 258c2ecf20Sopenharmony_ci movl 24(%rdi), %esi 268c2ecf20Sopenharmony_ci movl 28(%rdi), %edi 278c2ecf20Sopenharmony_ci1: \op 288c2ecf20Sopenharmony_ci2: movl %eax, (%r10) 298c2ecf20Sopenharmony_ci movl %r11d, %eax /* Return value */ 308c2ecf20Sopenharmony_ci movl %ecx, 4(%r10) 318c2ecf20Sopenharmony_ci movl %edx, 8(%r10) 328c2ecf20Sopenharmony_ci movl %ebx, 12(%r10) 338c2ecf20Sopenharmony_ci movl %r12d, 20(%r10) 348c2ecf20Sopenharmony_ci movl %esi, 24(%r10) 358c2ecf20Sopenharmony_ci movl %edi, 28(%r10) 368c2ecf20Sopenharmony_ci popq %r12 378c2ecf20Sopenharmony_ci popq %rbx 388c2ecf20Sopenharmony_ci RET 398c2ecf20Sopenharmony_ci3: 408c2ecf20Sopenharmony_ci movl $-EIO, %r11d 418c2ecf20Sopenharmony_ci jmp 2b 428c2ecf20Sopenharmony_ci 438c2ecf20Sopenharmony_ci _ASM_EXTABLE(1b, 3b) 448c2ecf20Sopenharmony_ciSYM_FUNC_END(\op\()_safe_regs) 458c2ecf20Sopenharmony_ci.endm 468c2ecf20Sopenharmony_ci 478c2ecf20Sopenharmony_ci#else /* X86_32 */ 488c2ecf20Sopenharmony_ci 498c2ecf20Sopenharmony_ci.macro op_safe_regs op 508c2ecf20Sopenharmony_ciSYM_FUNC_START(\op\()_safe_regs) 518c2ecf20Sopenharmony_ci pushl %ebx 528c2ecf20Sopenharmony_ci pushl %ebp 538c2ecf20Sopenharmony_ci pushl %esi 548c2ecf20Sopenharmony_ci pushl %edi 558c2ecf20Sopenharmony_ci pushl $0 /* Return value */ 568c2ecf20Sopenharmony_ci pushl %eax 578c2ecf20Sopenharmony_ci movl 4(%eax), %ecx 588c2ecf20Sopenharmony_ci movl 8(%eax), %edx 598c2ecf20Sopenharmony_ci movl 12(%eax), %ebx 608c2ecf20Sopenharmony_ci movl 20(%eax), %ebp 618c2ecf20Sopenharmony_ci movl 24(%eax), %esi 628c2ecf20Sopenharmony_ci movl 28(%eax), %edi 638c2ecf20Sopenharmony_ci movl (%eax), %eax 648c2ecf20Sopenharmony_ci1: \op 658c2ecf20Sopenharmony_ci2: pushl %eax 668c2ecf20Sopenharmony_ci movl 4(%esp), %eax 678c2ecf20Sopenharmony_ci popl (%eax) 688c2ecf20Sopenharmony_ci addl $4, %esp 698c2ecf20Sopenharmony_ci movl %ecx, 4(%eax) 708c2ecf20Sopenharmony_ci movl %edx, 8(%eax) 718c2ecf20Sopenharmony_ci movl %ebx, 12(%eax) 728c2ecf20Sopenharmony_ci movl %ebp, 20(%eax) 738c2ecf20Sopenharmony_ci movl %esi, 24(%eax) 748c2ecf20Sopenharmony_ci movl %edi, 28(%eax) 758c2ecf20Sopenharmony_ci popl %eax 768c2ecf20Sopenharmony_ci popl %edi 778c2ecf20Sopenharmony_ci popl %esi 788c2ecf20Sopenharmony_ci popl %ebp 798c2ecf20Sopenharmony_ci popl %ebx 808c2ecf20Sopenharmony_ci RET 818c2ecf20Sopenharmony_ci3: 828c2ecf20Sopenharmony_ci movl $-EIO, 4(%esp) 838c2ecf20Sopenharmony_ci jmp 2b 848c2ecf20Sopenharmony_ci 858c2ecf20Sopenharmony_ci _ASM_EXTABLE(1b, 3b) 868c2ecf20Sopenharmony_ciSYM_FUNC_END(\op\()_safe_regs) 878c2ecf20Sopenharmony_ci.endm 888c2ecf20Sopenharmony_ci 898c2ecf20Sopenharmony_ci#endif 908c2ecf20Sopenharmony_ci 918c2ecf20Sopenharmony_ciop_safe_regs rdmsr 928c2ecf20Sopenharmony_ciop_safe_regs wrmsr 938c2ecf20Sopenharmony_ci 94