cvmx-boot-vector.c

  1/*
  2 * This file is subject to the terms and conditions of the GNU General Public
  3 * License.  See the file "COPYING" in the main directory of this archive
  4 * for more details.
  5 *
  6 * Copyright (C) 2004-2017 Cavium, Inc.
  7 */
  8
  9
 10/*
 11  We install this program at the bootvector:
 12------------------------------------
 13	.set noreorder
 14	.set nomacro
 15	.set noat
 16reset_vector:
 17	dmtc0	$k0, $31, 0	# Save $k0 to DESAVE
 18	dmtc0	$k1, $31, 3	# Save $k1 to KScratch2
 19
 20	mfc0	$k0, $12, 0	# Status
 21	mfc0	$k1, $15, 1	# Ebase
 22
 23	ori	$k0, 0x84	# Enable 64-bit addressing, set
 24				# ERL (should already be set)
 25	andi	$k1, 0x3ff	# mask out core ID
 26
 27	mtc0	$k0, $12, 0	# Status
 28	sll	$k1, 5
 29
 30	lui	$k0, 0xbfc0
 31	cache	17, 0($0)	# Core-14345, clear L1 Dcache virtual
 32				# tags if the core hit an NMI
 33
 34	ld	$k0, 0x78($k0)	# k0 <- (bfc00078) pointer to the reset vector
 35	synci	0($0)		# Invalidate ICache to get coherent
 36				# view of target code.
 37
 38	daddu	$k0, $k0, $k1
 39	nop
 40
 41	ld	$k0, 0($k0)	# k0 <- core specific target address
 42	dmfc0	$k1, $31, 3	# Restore $k1 from KScratch2
 43
 44	beqz	$k0, wait_loop	# Spin in wait loop
 45	nop
 46
 47	jr	$k0
 48	nop
 49
 50	nop			# NOPs needed here to fill delay slots
 51	nop			# on endian reversal of previous instructions
 52
 53wait_loop:
 54	wait
 55	nop
 56
 57	b	wait_loop
 58	nop
 59
 60	nop
 61	nop
 62------------------------------------
 63
 640000000000000000 <reset_vector>:
 65   0:	40baf800	dmtc0	k0,c0_desave
 66   4:	40bbf803	dmtc0	k1,c0_kscratch2
 67
 68   8:	401a6000	mfc0	k0,c0_status
 69   c:	401b7801	mfc0	k1,c0_ebase
 70
 71  10:	375a0084	ori	k0,k0,0x84
 72  14:	337b03ff	andi	k1,k1,0x3ff
 73
 74  18:	409a6000	mtc0	k0,c0_status
 75  1c:	001bd940	sll	k1,k1,0x5
 76
 77  20:	3c1abfc0	lui	k0,0xbfc0
 78  24:	bc110000	cache	0x11,0(zero)
 79
 80  28:	df5a0078	ld	k0,120(k0)
 81  2c:	041f0000	synci	0(zero)
 82
 83  30:	035bd02d	daddu	k0,k0,k1
 84  34:	00000000	nop
 85
 86  38:	df5a0000	ld	k0,0(k0)
 87  3c:	403bf803	dmfc0	k1,c0_kscratch2
 88
 89  40:	13400005	beqz	k0,58 <wait_loop>
 90  44:	00000000	nop
 91
 92  48:	03400008	jr	k0
 93  4c:	00000000	nop
 94
 95  50:	00000000	nop
 96  54:	00000000	nop
 97
 980000000000000058 <wait_loop>:
 99  58:	42000020	wait
100  5c:	00000000	nop
101
102  60:	1000fffd	b	58 <wait_loop>
103  64:	00000000	nop
104
105  68:	00000000	nop
106  6c:	00000000	nop
107
108 */
109
110#include <asm/octeon/cvmx-boot-vector.h>
111
112static unsigned long long _cvmx_bootvector_data[16] = {
113	0x40baf80040bbf803ull,  /* patch low order 8-bits if no KScratch*/
114	0x401a6000401b7801ull,
115	0x375a0084337b03ffull,
116	0x409a6000001bd940ull,
117	0x3c1abfc0bc110000ull,
118	0xdf5a0078041f0000ull,
119	0x035bd02d00000000ull,
120	0xdf5a0000403bf803ull,  /* patch low order 8-bits if no KScratch*/
121	0x1340000500000000ull,
122	0x0340000800000000ull,
123	0x0000000000000000ull,
124	0x4200002000000000ull,
125	0x1000fffd00000000ull,
126	0x0000000000000000ull,
127	OCTEON_BOOT_MOVEABLE_MAGIC1,
128	0 /* To be filled in with address of vector block*/
129};
130
131/* 2^10 CPUs */
132#define VECTOR_TABLE_SIZE (1024 * sizeof(struct cvmx_boot_vector_element))
133
134static void cvmx_boot_vector_init(void *mem)
135{
136	uint64_t kseg0_mem;
137	int i;
138
139	memset(mem, 0, VECTOR_TABLE_SIZE);
140	kseg0_mem = cvmx_ptr_to_phys(mem) | 0x8000000000000000ull;
141
142	for (i = 0; i < 15; i++) {
143		uint64_t v = _cvmx_bootvector_data[i];
144
145		if (OCTEON_IS_OCTEON1PLUS() && (i == 0 || i == 7))
146			v &= 0xffffffff00000000ull; /* KScratch not available */
147		cvmx_write_csr(CVMX_MIO_BOOT_LOC_ADR, i * 8);
148		cvmx_write_csr(CVMX_MIO_BOOT_LOC_DAT, v);
149	}
150	cvmx_write_csr(CVMX_MIO_BOOT_LOC_ADR, 15 * 8);
151	cvmx_write_csr(CVMX_MIO_BOOT_LOC_DAT, kseg0_mem);
152	cvmx_write_csr(CVMX_MIO_BOOT_LOC_CFGX(0), 0x81fc0000);
153}
154
155/**
156 * Get a pointer to the per-core table of reset vector pointers
157 *
158 */
159struct cvmx_boot_vector_element *cvmx_boot_vector_get(void)
160{
161	struct cvmx_boot_vector_element *ret;
162
163	ret = cvmx_bootmem_alloc_named_range_once(VECTOR_TABLE_SIZE, 0,
164		(1ull << 32) - 1, 8, "__boot_vector1__", cvmx_boot_vector_init);
165	return ret;
166}
167EXPORT_SYMBOL(cvmx_boot_vector_get);