| 1 | /*
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| 2 | * Copyright (c) 2005 Martin Decky
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| 3 | * Copyright (c) 2006 Jakub Jermar
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| 4 | * All rights reserved.
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| 5 | *
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| 6 | * Redistribution and use in source and binary forms, with or without
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| 7 | * modification, are permitted provided that the following conditions
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| 8 | * are met:
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| 9 | *
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| 10 | * - Redistributions of source code must retain the above copyright
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| 11 | * notice, this list of conditions and the following disclaimer.
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| 12 | * - Redistributions in binary form must reproduce the above copyright
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| 13 | * notice, this list of conditions and the following disclaimer in the
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| 14 | * documentation and/or other materials provided with the distribution.
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| 15 | * - The name of the author may not be used to endorse or promote products
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| 16 | * derived from this software without specific prior written permission.
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| 17 | *
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| 18 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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| 19 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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| 20 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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| 21 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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| 22 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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| 23 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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| 24 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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| 25 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 26 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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| 27 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 28 | */
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| 29 |
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| 30 | #include <arch/main.h>
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| 31 | #include <arch/arch.h>
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| 32 | #include <arch/asm.h>
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| 33 | #include <arch/ofw.h>
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| 34 | #include <genarch/ofw.h>
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| 35 | #include <genarch/ofw_tree.h>
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| 36 | #include <halt.h>
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| 37 | #include <printf.h>
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| 38 | #include <memstr.h>
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| 39 | #include <version.h>
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| 40 | #include <macros.h>
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| 41 | #include <align.h>
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| 42 | #include <str.h>
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| 43 | #include <errno.h>
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| 44 | #include <payload.h>
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| 45 |
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| 46 | /* The lowest ID (read from the VER register) of some US3 CPU model */
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| 47 | #define FIRST_US3_CPU 0x14
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| 48 |
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| 49 | /* The greatest ID (read from the VER register) of some US3 CPU model */
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| 50 | #define LAST_US3_CPU 0x19
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| 51 |
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| 52 | /* UltraSPARC IIIi processor implementation code */
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| 53 | #define US_IIIi_CODE 0x15
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| 54 |
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| 55 | #define OBP_BIAS 0x400000
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| 56 |
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| 57 | #define BALLOC_MAX_SIZE 131072
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| 58 |
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| 59 | #define TOP2ADDR(top) (((void *) KERNEL_ADDRESS) + (top))
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| 60 |
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| 61 | /** UltraSPARC architecture */
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| 62 | static uint8_t arch;
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| 63 |
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| 64 | /** UltraSPARC subarchitecture */
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| 65 | static uint8_t subarch;
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| 66 |
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| 67 | /** Mask of the MID field inside the ICBUS_CONFIG register
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| 68 | *
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| 69 | * Shifted by MID_SHIFT bits to the right
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| 70 | *
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| 71 | */
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| 72 | static uint16_t mid_mask;
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| 73 |
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| 74 | static bootinfo_t bootinfo;
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| 75 |
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| 76 | /** Detect the UltraSPARC architecture
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| 77 | *
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| 78 | * Detection is done by inspecting the property called "compatible"
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| 79 | * in the OBP root node. Currently sun4u and sun4v are supported.
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| 80 | * Set global variable "arch" to the correct value.
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| 81 | *
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| 82 | */
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| 83 | static void arch_detect(void)
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| 84 | {
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| 85 | phandle root = ofw_find_device("/");
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| 86 | char compatible[OFW_TREE_PROPERTY_MAX_VALUELEN];
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| 87 |
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| 88 | if (ofw_get_property(root, "compatible", compatible,
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| 89 | OFW_TREE_PROPERTY_MAX_VALUELEN) <= 0) {
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| 90 | printf("Warning: Unable to determine architecture, assuming sun4u.\n");
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| 91 | arch = ARCH_SUN4U;
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| 92 | return;
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| 93 | }
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| 94 |
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| 95 | if (str_cmp(compatible, "sun4v") != 0) {
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| 96 | /*
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| 97 | * As not all sun4u machines have "sun4u" in their "compatible"
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| 98 | * OBP property (e.g. Serengeti's OBP "compatible" property is
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| 99 | * "SUNW,Serengeti"), we will by default fallback to sun4u if
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| 100 | * an unknown value of the "compatible" property is encountered.
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| 101 | */
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| 102 | if (str_cmp(compatible, "sun4u") != 0)
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| 103 | printf("Warning: Unknown architecture, assuming sun4u.\n");
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| 104 | arch = ARCH_SUN4U;
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| 105 | } else
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| 106 | arch = ARCH_SUN4V;
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| 107 | }
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| 108 |
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| 109 | /** Detect the subarchitecture (US, US3) of sun4u
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| 110 | *
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| 111 | * Set the global variables "subarch" and "mid_mask" to
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| 112 | * correct values.
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| 113 | *
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| 114 | */
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| 115 | static void sun4u_subarch_detect(void)
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| 116 | {
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| 117 | uint64_t ver;
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| 118 | asm volatile (
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| 119 | "rdpr %%ver, %[ver]\n"
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| 120 | : [ver] "=r" (ver)
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| 121 | );
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| 122 |
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| 123 | ver = (ver << 16) >> 48;
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| 124 |
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| 125 | if ((ver >= FIRST_US3_CPU) && (ver <= LAST_US3_CPU)) {
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| 126 | subarch = SUBARCH_US3;
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| 127 |
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| 128 | if (ver == US_IIIi_CODE)
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| 129 | mid_mask = (1 << 5) - 1;
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| 130 | else
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| 131 | mid_mask = (1 << 10) - 1;
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| 132 |
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| 133 | } else if (ver < FIRST_US3_CPU) {
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| 134 | subarch = SUBARCH_US;
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| 135 | mid_mask = (1 << 5) - 1;
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| 136 | } else {
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| 137 | printf("Warning: This CPU is not supported.");
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| 138 | subarch = SUBARCH_UNKNOWN;
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| 139 | }
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| 140 | }
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| 141 |
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| 142 | /** Perform sun4u-specific SMP initialization.
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| 143 | *
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| 144 | */
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| 145 | static void sun4u_smp(void)
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| 146 | {
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| 147 | #ifdef CONFIG_AP
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| 148 | printf("Checking for secondary processors ...\n");
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| 149 | ofw_cpu(mid_mask, bootinfo.physmem_start);
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| 150 | #endif
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| 151 | }
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| 152 |
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| 153 | /** Perform sun4v-specific fixups.
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| 154 | *
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| 155 | */
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| 156 | static void sun4v_fixups(void)
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| 157 | {
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| 158 | /*
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| 159 | * When SILO booted, the OBP had established a virtual to physical
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| 160 | * memory mapping. This mapping is not an identity since the
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| 161 | * physical memory starts at non-zero address.
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| 162 | *
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| 163 | * However, the mapping even does not map virtual address 0
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| 164 | * onto the starting address of the physical memory, but onto an
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| 165 | * address which is 0x400000 (OBP_BIAS) bytes higher.
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| 166 | *
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| 167 | * The reason is that the OBP had already used the memory just
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| 168 | * at the beginning of the physical memory. Thus that memory cannot
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| 169 | * be used by SILO (nor the bootloader).
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| 170 | *
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| 171 | * So far, we solve it by a nasty workaround:
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| 172 | *
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| 173 | * We pretend that the physical memory starts 0x400000 (OBP_BIAS)
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| 174 | * bytes further than it actually does (and hence pretend that the
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| 175 | * physical memory is 0x400000 bytes smaller). Of course, the value
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| 176 | * 0x400000 will most probably depend on the machine and OBP version
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| 177 | * (the workaround works on Simics).
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| 178 | *
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| 179 | * A proper solution would be to inspect the "available" property
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| 180 | * of the "/memory" node to find out which parts of memory
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| 181 | * are used by OBP and redesign the algorithm of copying
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| 182 | * kernel/init tasks/ramdisk from the bootable image to memory.
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| 183 | */
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| 184 | bootinfo.physmem_start += OBP_BIAS;
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| 185 | bootinfo.memmap.zones[0].start += OBP_BIAS;
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| 186 | bootinfo.memmap.zones[0].size -= OBP_BIAS;
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| 187 | bootinfo.memmap.total -= OBP_BIAS;
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| 188 | }
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| 189 |
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| 190 | void bootstrap(void)
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| 191 | {
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| 192 | version_print();
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| 193 |
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| 194 | arch_detect();
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| 195 | if (arch == ARCH_SUN4U)
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| 196 | sun4u_subarch_detect();
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| 197 | else
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| 198 | subarch = SUBARCH_UNKNOWN;
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| 199 |
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| 200 | bootinfo.physmem_start = ofw_get_physmem_start();
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| 201 | ofw_memmap(&bootinfo.memmap);
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| 202 |
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| 203 | if (arch == ARCH_SUN4V)
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| 204 | sun4v_fixups();
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| 205 |
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| 206 | void *bootinfo_pa = ofw_translate(&bootinfo);
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| 207 | void *kernel_address_pa = ofw_translate((void *) KERNEL_ADDRESS);
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| 208 | void *loader_address_pa = ofw_translate((void *) LOADER_ADDRESS);
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| 209 |
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| 210 | printf("\nMemory statistics (total %" PRIu64 " MB, starting at %p)\n",
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| 211 | bootinfo.memmap.total >> 20, (void *) bootinfo.physmem_start);
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| 212 | printf(" %p|%p: boot info structure\n", &bootinfo, (void *) bootinfo_pa);
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| 213 | printf(" %p|%p: kernel entry point\n",
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| 214 | (void *) KERNEL_ADDRESS, (void *) kernel_address_pa);
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| 215 | printf(" %p|%p: loader entry point\n",
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| 216 | (void *) LOADER_ADDRESS, (void *) loader_address_pa);
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| 217 |
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| 218 | /*
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| 219 | * At this point, we claim and map the physical memory that we
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| 220 | * are going to use. We should be safe in case of the virtual
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| 221 | * address space because the OpenFirmware, according to its
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| 222 | * SPARC binding, should restrict its use of virtual memory to
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| 223 | * addresses from [0xffd00000; 0xffefffff] and [0xfe000000;
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| 224 | * 0xfeffffff].
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| 225 | */
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| 226 |
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| 227 | size_t sz = ALIGN_UP(payload_unpacked_size(), PAGE_SIZE);
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| 228 | ofw_claim_phys((void *) (bootinfo.physmem_start + KERNEL_ADDRESS), sz);
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| 229 | ofw_map((void *) (bootinfo.physmem_start + KERNEL_ADDRESS),
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| 230 | (void *) KERNEL_ADDRESS, sz, -1);
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| 231 |
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| 232 | /* Extract components. */
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| 233 |
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| 234 | // TODO: Cache-coherence callback?
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| 235 | extract_payload(&bootinfo.taskmap, (void *) KERNEL_ADDRESS,
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| 236 | (void *) KERNEL_ADDRESS + sz, KERNEL_ADDRESS, NULL);
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| 237 |
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| 238 | /*
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| 239 | * Claim and map the physical memory for the boot allocator.
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| 240 | * Initialize the boot allocator.
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| 241 | */
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| 242 | printf("Setting up boot allocator ...\n");
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| 243 | void *balloc_base = (void *) KERNEL_ADDRESS + sz;
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| 244 | ofw_claim_phys(bootinfo.physmem_start + balloc_base, BALLOC_MAX_SIZE);
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| 245 | ofw_map(bootinfo.physmem_start + balloc_base, balloc_base,
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| 246 | BALLOC_MAX_SIZE, -1);
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| 247 | balloc_init(&bootinfo.ballocs, balloc_base, (uintptr_t) balloc_base,
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| 248 | BALLOC_MAX_SIZE);
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| 249 |
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| 250 | printf("Setting up screens ...\n");
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| 251 | ofw_setup_screens();
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| 252 |
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| 253 | printf("Canonizing OpenFirmware device tree ...\n");
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| 254 | bootinfo.ofw_root = ofw_tree_build();
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| 255 |
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| 256 | if (arch == ARCH_SUN4U)
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| 257 | sun4u_smp();
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| 258 |
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| 259 | printf("Booting the kernel ...\n");
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| 260 | jump_to_kernel(bootinfo.physmem_start | BSP_PROCESSOR, &bootinfo, subarch,
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| 261 | (void *) KERNEL_ADDRESS);
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| 262 | }
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