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/*
* AMD Memory Encryption Support
*
* Copyright (C) 2016 Advanced Micro Devices, Inc.
*
* Author: Tom Lendacky <thomas.lendacky@amd.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/linkage.h>
#include <asm/pgtable.h>
#include <asm/page.h>
#include <asm/processor-flags.h>
#include <asm/msr-index.h>
.text
.code64
ENTRY(sme_encrypt_execute)
/*
* Entry parameters:
* RDI - virtual address for the encrypted mapping
* RSI - virtual address for the decrypted mapping
* RDX - length to encrypt
* RCX - virtual address of the encryption workarea, including:
* - stack page (PAGE_SIZE)
* - encryption routine page (PAGE_SIZE)
* - intermediate copy buffer (PMD_PAGE_SIZE)
* R8 - physcial address of the pagetables to use for encryption
*/
push %rbp
movq %rsp, %rbp /* RBP now has original stack pointer */
/* Set up a one page stack in the non-encrypted memory area */
movq %rcx, %rax /* Workarea stack page */
leaq PAGE_SIZE(%rax), %rsp /* Set new stack pointer */
addq $PAGE_SIZE, %rax /* Workarea encryption routine */
push %r12
movq %rdi, %r10 /* Encrypted area */
movq %rsi, %r11 /* Decrypted area */
movq %rdx, %r12 /* Area length */
/* Copy encryption routine into the workarea */
movq %rax, %rdi /* Workarea encryption routine */
leaq __enc_copy(%rip), %rsi /* Encryption routine */
movq $(.L__enc_copy_end - __enc_copy), %rcx /* Encryption routine length */
rep movsb
/* Setup registers for call */
movq %r10, %rdi /* Encrypted area */
movq %r11, %rsi /* Decrypted area */
movq %r8, %rdx /* Pagetables used for encryption */
movq %r12, %rcx /* Area length */
movq %rax, %r8 /* Workarea encryption routine */
addq $PAGE_SIZE, %r8 /* Workarea intermediate copy buffer */
call *%rax /* Call the encryption routine */
pop %r12
movq %rbp, %rsp /* Restore original stack pointer */
pop %rbp
ret
ENDPROC(sme_encrypt_execute)
ENTRY(__enc_copy)
/*
* Routine used to encrypt memory in place.
* This routine must be run outside of the kernel proper since
* the kernel will be encrypted during the process. So this
* routine is defined here and then copied to an area outside
* of the kernel where it will remain and run decrypted
* during execution.
*
* On entry the registers must be:
* RDI - virtual address for the encrypted mapping
* RSI - virtual address for the decrypted mapping
* RDX - address of the pagetables to use for encryption
* RCX - length of area
* R8 - intermediate copy buffer
*
* RAX - points to this routine
*
* The area will be encrypted by copying from the non-encrypted
* memory space to an intermediate buffer and then copying from the
* intermediate buffer back to the encrypted memory space. The physical
* addresses of the two mappings are the same which results in the area
* being encrypted "in place".
*/
/* Enable the new page tables */
mov %rdx, %cr3
/* Flush any global TLBs */
mov %cr4, %rdx
andq $~X86_CR4_PGE, %rdx
mov %rdx, %cr4
orq $X86_CR4_PGE, %rdx
mov %rdx, %cr4
push %r15
push %r12
movq %rcx, %r9 /* Save area length */
movq %rdi, %r10 /* Save encrypted area address */
movq %rsi, %r11 /* Save decrypted area address */
/* Set the PAT register PA5 entry to write-protect */
movl $MSR_IA32_CR_PAT, %ecx
rdmsr
mov %rdx, %r15 /* Save original PAT value */
andl $0xffff00ff, %edx /* Clear PA5 */
orl $0x00000500, %edx /* Set PA5 to WP */
wrmsr
wbinvd /* Invalidate any cache entries */
/* Copy/encrypt up to 2MB at a time */
movq $PMD_PAGE_SIZE, %r12
1:
cmpq %r12, %r9
jnb 2f
movq %r9, %r12
2:
movq %r11, %rsi /* Source - decrypted area */
movq %r8, %rdi /* Dest - intermediate copy buffer */
movq %r12, %rcx
rep movsb
movq %r8, %rsi /* Source - intermediate copy buffer */
movq %r10, %rdi /* Dest - encrypted area */
movq %r12, %rcx
rep movsb
addq %r12, %r11
addq %r12, %r10
subq %r12, %r9 /* Kernel length decrement */
jnz 1b /* Kernel length not zero? */
/* Restore PAT register */
movl $MSR_IA32_CR_PAT, %ecx
rdmsr
mov %r15, %rdx /* Restore original PAT value */
wrmsr
pop %r12
pop %r15
ret
.L__enc_copy_end:
ENDPROC(__enc_copy)
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