microblaze/cpu/start.S

44 	 * 2. Store word offset value to address 0x0
45 	 * 3. Load just byte from address 0x0
46 	 * 4a) LITTLE endian - r10 contains 0x2 because it is the smallest
47 	 *     value that's why is on address 0x0
48 	 * 4b) BIG endian - r10 contains 0x0 because 0x2 offset is on addr 0x3
50 	addik	r6, r0, 0x2 /* BIG/LITTLE endian offset */
51 	lwi	r7, r0, 0x28
52 	swi	r6, r0, 0x28 /* used first unused MB vector */
53 	lbui	r10, r0, 0x28 /* used first unused MB vector */
54 	swi	r7, r0, 0x28
57 	addi	r2, r0, 0xb0000000	/* hex b000 opcode imm */
58 	addi	r3, r0, 0xb8080000	/* hew b808 opcode brai */
62 	swi	r2, r0, 0x0	/* reset address - imm opcode */
63 	swi	r3, r0, 0x4	/* reset address - brai opcode */
68 	rsubi	r8, r10, 0x2
70 	rsubi	r8, r10, 0x6
76 	swi	r2, r0, 0x8	/* user vector exception - imm opcode */
77 	swi	r3, r0, 0xC	/* user vector exception - brai opcode */
83 	 * 0x8: 0xB000XXXX
84 	 * 0xC: 0xB808XXXX
88 	 * 0xa address. Big endian use offset in r10=0 that's why is it just
89 	 * 0xa address. The same is done for the least significant 16 bits
90 	 * for 0xe address.
93 	 * 0x8: 0xXXXX00B0
94 	 * 0xC: 0xXXXX08B8
96 	 * Offset is for little endian setup to 0x2. rsubi instruction decrease
98 	 * 0x8 for the most significant 16 bits and
99 	 * 0xC for the least significant 16 bits
102 	rsubi	r8, r10, 0xa
104 	rsubi	r8, r10, 0xe
109 	swi	r2, r0, 0x10	/* interrupt - imm opcode */
110 	swi	r3, r0, 0x14	/* interrupt - brai opcode */
115 	rsubi	r8, r10, 0x12
117 	rsubi	r8, r10, 0x16
121 	swi	r2, r0, 0x20	/* hardware exception - imm opcode */
122 	swi	r3, r0, 0x24	/* hardware exception - brai opcode */
127 	rsubi	r8, r10, 0x22
129 	rsubi	r8, r10, 0x26
134 	addik	r5, r0, 0
141 	ori	r12, r12, 0x1a0
152 	swi     r0, r5, 0 /* write zero to loc */
195 	andi	r4, r4, 0xffff
211 	andi	r3, r3, 0xffff
231 	addi	r1, r5, 0 /* Start to use new SP */
232 	addi	r31, r6, 0 /* Start to use new GD */
252 	addik	r6, r0, 0x2 /* BIG/LITTLE endian offset */
253 	lwi	r7, r0, 0x28
254 	swi	r6, r0, 0x28 /* used first unused MB vector */
255 	lbui	r10, r0, 0x28 /* used first unused MB vector */
256 	swi	r7, r0, 0x28
263 	rsubi	r8, r10, 0xa
265 	rsubi	r8, r10, 0xe
272 	rsubi	r8, r10, 0x22
274 	rsubi	r8, r10, 0x26
281 	rsubi	r8, r10, 0x12
283 	rsubi	r8, r10, 0x16
293 	addik	r22, r22, -0x10
310 	addik	r5, r0, 0
315 2:	addi	r5, r31, 0 /* gd is initialized in board_r.c */