| 1 | /*- |
| 2 | * Copyright (c) 1999 Brian Fundakowski Feldman |
| 3 | * All rights reserved. |
| 4 | * |
| 5 | * Redistribution and use in source and binary forms, with or without |
| 6 | * modification, are permitted provided that the following conditions |
| 7 | * are met: |
| 8 | * 1. Redistributions of source code must retain the above copyright |
| 9 | * notice, this list of conditions and the following disclaimer. |
| 10 | * 2. Redistributions in binary form must reproduce the above copyright |
| 11 | * notice, this list of conditions and the following disclaimer in the |
| 12 | * documentation and/or other materials provided with the distribution. |
| 13 | * |
| 14 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
| 15 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 16 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 17 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
| 18 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 19 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 20 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 21 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 22 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 23 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 24 | * SUCH DAMAGE. |
| 25 | * |
| 26 | * $FreeBSD: src/sys/i386/i386/k6_mem.c,v 1.4.2.2 2002/09/16 21:58:41 dwmalone Exp $ |
| 27 | * $DragonFly: src/sys/platform/pc32/i386/k6_mem.c,v 1.3 2003/07/06 21:23:48 dillon Exp $ |
| 28 | * |
| 29 | */ |
| 30 | |
| 31 | #include <sys/param.h> |
| 32 | #include <sys/kernel.h> |
| 33 | #include <sys/systm.h> |
| 34 | #include <sys/ioccom.h> |
| 35 | #include <sys/malloc.h> |
| 36 | #include <sys/memrange.h> |
| 37 | |
| 38 | #include <machine/md_var.h> |
| 39 | #include <machine/specialreg.h> |
| 40 | #include <machine/lock.h> |
| 41 | |
| 42 | /* |
| 43 | * A K6-2 MTRR is defined as the highest 15 bits having the address, the next |
| 44 | * 15 having the mask, the 1st bit being "write-combining" and the 0th bit |
| 45 | * being "uncacheable". |
| 46 | * |
| 47 | * Address Mask WC UC |
| 48 | * | XXXXXXXXXXXXXXX | XXXXXXXXXXXXXXX | X | X | |
| 49 | * |
| 50 | * There are two of these in the 64-bit UWCCR. |
| 51 | */ |
| 52 | |
| 53 | /* |
| 54 | * NOTE: I do _not_ comment my code unless it's truly necessary. Don't |
| 55 | * expect anything frivolous here, and do NOT touch my bit-shifts |
| 56 | * unless you want to break this. |
| 57 | */ |
| 58 | |
| 59 | #define UWCCR 0xc0000085 |
| 60 | |
| 61 | #define k6_reg_get(reg, addr, mask, wc, uc) do { \ |
| 62 | addr = (reg) & 0xfffe0000; \ |
| 63 | mask = ((reg) & 0x1fffc) >> 2; \ |
| 64 | wc = ((reg) & 0x2) >> 1; \ |
| 65 | uc = (reg) & 0x1; \ |
| 66 | } while (0) |
| 67 | |
| 68 | #define k6_reg_make(addr, mask, wc, uc) \ |
| 69 | ((addr) | ((mask) << 2) | ((wc) << 1) | uc) |
| 70 | |
| 71 | static void k6_mrinit(struct mem_range_softc *sc); |
| 72 | static int k6_mrset(struct mem_range_softc *, struct mem_range_desc *, int *); |
| 73 | static __inline int k6_mrmake(struct mem_range_desc *, u_int32_t *); |
| 74 | static void k6_mem_drvinit(void *); |
| 75 | |
| 76 | static struct mem_range_ops k6_mrops = { |
| 77 | k6_mrinit, |
| 78 | k6_mrset, |
| 79 | NULL |
| 80 | }; |
| 81 | |
| 82 | static __inline int |
| 83 | k6_mrmake(struct mem_range_desc *desc, u_int32_t *mtrr) { |
| 84 | u_int32_t len = 0, wc, uc; |
| 85 | register int bit; |
| 86 | |
| 87 | if (desc->mr_base &~ 0xfffe0000) |
| 88 | return EINVAL; |
| 89 | if (desc->mr_len < 131072 || !powerof2(desc->mr_len)) |
| 90 | return EINVAL; |
| 91 | if (desc->mr_flags &~ (MDF_WRITECOMBINE|MDF_UNCACHEABLE|MDF_FORCE)) |
| 92 | return EOPNOTSUPP; |
| 93 | |
| 94 | for (bit = ffs(desc->mr_len >> 17) - 1; bit < 15; bit++) |
| 95 | len |= 1 << bit; |
| 96 | wc = (desc->mr_flags & MDF_WRITECOMBINE) ? 1 : 0; |
| 97 | uc = (desc->mr_flags & MDF_UNCACHEABLE) ? 1 : 0; |
| 98 | |
| 99 | *mtrr = k6_reg_make(desc->mr_base, len, wc, uc); |
| 100 | return 0; |
| 101 | } |
| 102 | |
| 103 | static void |
| 104 | k6_mrinit(struct mem_range_softc *sc) { |
| 105 | u_int64_t reg; |
| 106 | u_int32_t addr, mask, wc, uc; |
| 107 | int d; |
| 108 | |
| 109 | sc->mr_cap = 0; |
| 110 | sc->mr_ndesc = 2; /* XXX (BFF) For now, we only have one msr for this */ |
| 111 | sc->mr_desc = malloc(sc->mr_ndesc * sizeof(struct mem_range_desc), |
| 112 | M_MEMDESC, M_NOWAIT); |
| 113 | if (sc->mr_desc == NULL) |
| 114 | panic("k6_mrinit: malloc returns NULL"); |
| 115 | bzero(sc->mr_desc, sc->mr_ndesc * sizeof(struct mem_range_desc)); |
| 116 | |
| 117 | reg = rdmsr(UWCCR); |
| 118 | for (d = 0; d < sc->mr_ndesc; d++) { |
| 119 | u_int32_t one = (reg & (0xffffffff << (32 * d))) >> (32 * d); |
| 120 | |
| 121 | k6_reg_get(one, addr, mask, wc, uc); |
| 122 | sc->mr_desc[d].mr_base = addr; |
| 123 | sc->mr_desc[d].mr_len = ffs(mask) << 17; |
| 124 | if (wc) |
| 125 | sc->mr_desc[d].mr_flags |= MDF_WRITECOMBINE; |
| 126 | if (uc) |
| 127 | sc->mr_desc[d].mr_flags |= MDF_UNCACHEABLE; |
| 128 | } |
| 129 | |
| 130 | printf("K6-family MTRR support enabled (%d registers)\n", sc->mr_ndesc); |
| 131 | } |
| 132 | |
| 133 | static int |
| 134 | k6_mrset(struct mem_range_softc *sc, struct mem_range_desc *desc, int *arg) { |
| 135 | u_int64_t reg; |
| 136 | u_int32_t mtrr; |
| 137 | int error, d; |
| 138 | |
| 139 | switch (*arg) { |
| 140 | case MEMRANGE_SET_UPDATE: |
| 141 | error = k6_mrmake(desc, &mtrr); |
| 142 | if (error) |
| 143 | return error; |
| 144 | for (d = 0; d < sc->mr_ndesc; d++) { |
| 145 | if (!sc->mr_desc[d].mr_len) { |
| 146 | sc->mr_desc[d] = *desc; |
| 147 | goto out; |
| 148 | } |
| 149 | if (sc->mr_desc[d].mr_base == desc->mr_base && |
| 150 | sc->mr_desc[d].mr_len == desc->mr_len) |
| 151 | return EEXIST; |
| 152 | } |
| 153 | |
| 154 | return ENOSPC; |
| 155 | case MEMRANGE_SET_REMOVE: |
| 156 | mtrr = 0; |
| 157 | for (d = 0; d < sc->mr_ndesc; d++) |
| 158 | if (sc->mr_desc[d].mr_base == desc->mr_base && |
| 159 | sc->mr_desc[d].mr_len == desc->mr_len) { |
| 160 | bzero(&sc->mr_desc[d], sizeof(sc->mr_desc[d])); |
| 161 | goto out; |
| 162 | } |
| 163 | |
| 164 | return ENOENT; |
| 165 | default: |
| 166 | return EOPNOTSUPP; |
| 167 | } |
| 168 | |
| 169 | out: |
| 170 | |
| 171 | mpintr_lock(); |
| 172 | wbinvd(); |
| 173 | reg = rdmsr(UWCCR); |
| 174 | reg &= ~(0xffffffff << (32 * d)); |
| 175 | reg |= mtrr << (32 * d); |
| 176 | wrmsr(UWCCR, reg); |
| 177 | wbinvd(); |
| 178 | mpintr_unlock(); |
| 179 | |
| 180 | return 0; |
| 181 | } |
| 182 | |
| 183 | static void |
| 184 | k6_mem_drvinit(void *unused) { |
| 185 | if (!strcmp(cpu_vendor, "AuthenticAMD") && |
| 186 | (cpu_id & 0xf00) == 0x500 && |
| 187 | ((cpu_id & 0xf0) > 0x80 || |
| 188 | ((cpu_id & 0xf0) == 0x80 && |
| 189 | (cpu_id & 0xf) > 0x7)) |
| 190 | ) |
| 191 | mem_range_softc.mr_op = &k6_mrops; |
| 192 | } |
| 193 | |
| 194 | SYSINIT(k6memdev, SI_SUB_DRIVERS, SI_ORDER_FIRST, k6_mem_drvinit, NULL) |