crypto: aes - Export x86 AES encrypt/decrypt functions

Intel AES-NI AES acceleration instructions touch XMM state, to use
that in soft_irq context, general x86 AES implementation is used as
fallback. The first parameter is changed from struct crypto_tfm * to
struct crypto_aes_ctx * to make it easier to deal with 16 bytes
alignment requirement of AES-NI implementation.

Signed-off-by: Huang Ying <[e-mail]>
Signed-off-by: Herbert Xu <[e-mail]>

arch/x86/crypto/aes-i586-asm_32.S

···
 #define tlen 1024   // length of each of 4 'xor' arrays (256 32-bit words)
 
 /* offsets to parameters with one register pushed onto stack */
-#define tfm 8
+#define ctx 8
 #define out_blk 12
 #define in_blk 16
 
-/* offsets in crypto_tfm structure */
-#define klen (crypto_tfm_ctx_offset + 480)
-#define ekey (crypto_tfm_ctx_offset + 0)
-#define dkey (crypto_tfm_ctx_offset + 240)
+/* offsets in crypto_aes_ctx structure */
+#define klen (480)
+#define ekey (0)
+#define dkey (240)
 
 // register mapping for encrypt and decrypt subroutines
 
···
 	do_col (table, r5,r0,r1,r4, r2,r3);		/* idx=r5 */
 
 // AES (Rijndael) Encryption Subroutine
-/* void aes_enc_blk(struct crypto_tfm *tfm, u8 *out_blk, const u8 *in_blk) */
+/* void aes_enc_blk(struct crypto_aes_ctx *ctx, u8 *out_blk, const u8 *in_blk) */
 
 .global  aes_enc_blk
 
···
 
 aes_enc_blk:
 	push    %ebp
-	mov     tfm(%esp),%ebp
+	mov     ctx(%esp),%ebp
 
 // CAUTION: the order and the values used in these assigns 
 // rely on the register mappings
···
 	ret
 
 // AES (Rijndael) Decryption Subroutine
-/* void aes_dec_blk(struct crypto_tfm *tfm, u8 *out_blk, const u8 *in_blk) */
+/* void aes_dec_blk(struct crypto_aes_ctx *ctx, u8 *out_blk, const u8 *in_blk) */
 
 .global  aes_dec_blk
 
···
 
 aes_dec_blk:
 	push    %ebp
-	mov     tfm(%esp),%ebp
+	mov     ctx(%esp),%ebp
 
 // CAUTION: the order and the values used in these assigns 
 // rely on the register mappings

arch/x86/crypto/aes-x86_64-asm_64.S

···
 
 #include <asm/asm-offsets.h>
 
-#define BASE crypto_tfm_ctx_offset
-
 #define R1	%rax
 #define R1E	%eax
 #define R1X	%ax
···
 	.align	8;			\
 FUNC:	movq	r1,r2;			\
 	movq	r3,r4;			\
-	leaq	BASE+KEY+48(r8),r9;	\
+	leaq	KEY+48(r8),r9;		\
 	movq	r10,r11;		\
 	movl	(r7),r5 ## E;		\
 	movl	4(r7),r1 ## E;		\
 	movl	8(r7),r6 ## E;		\
 	movl	12(r7),r7 ## E;		\
-	movl	BASE+480(r8),r10 ## E;	\
+	movl	480(r8),r10 ## E;	\
 	xorl	-48(r9),r5 ## E;	\
 	xorl	-44(r9),r1 ## E;	\
 	xorl	-40(r9),r6 ## E;	\

arch/x86/crypto/aes_glue.c

···
 
 #include <crypto/aes.h>
 
-asmlinkage void aes_enc_blk(struct crypto_tfm *tfm, u8 *out, const u8 *in);
-asmlinkage void aes_dec_blk(struct crypto_tfm *tfm, u8 *out, const u8 *in);
+asmlinkage void aes_enc_blk(struct crypto_aes_ctx *ctx, u8 *out, const u8 *in);
+asmlinkage void aes_dec_blk(struct crypto_aes_ctx *ctx, u8 *out, const u8 *in);
+
+void crypto_aes_encrypt_x86(struct crypto_aes_ctx *ctx, u8 *dst, const u8 *src)
+{
+	aes_enc_blk(ctx, dst, src);
+}
+EXPORT_SYMBOL_GPL(crypto_aes_encrypt_x86);
+
+void crypto_aes_decrypt_x86(struct crypto_aes_ctx *ctx, u8 *dst, const u8 *src)
+{
+	aes_dec_blk(ctx, dst, src);
+}
+EXPORT_SYMBOL_GPL(crypto_aes_decrypt_x86);
 
 static void aes_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
 {
-	aes_enc_blk(tfm, dst, src);
+	aes_enc_blk(crypto_tfm_ctx(tfm), dst, src);
 }
 
 static void aes_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
 {
-	aes_dec_blk(tfm, dst, src);
+	aes_dec_blk(crypto_tfm_ctx(tfm), dst, src);
 }
 
 static struct crypto_alg aes_alg = {

arch/x86/include/asm/aes.h

···
+#ifndef ASM_X86_AES_H
+#define ASM_X86_AES_H
+
+#include <linux/crypto.h>
+#include <crypto/aes.h>
+
+void crypto_aes_encrypt_x86(struct crypto_aes_ctx *ctx, u8 *dst,
+			    const u8 *src);
+void crypto_aes_decrypt_x86(struct crypto_aes_ctx *ctx, u8 *dst,
+			    const u8 *src);
+#endif