276 lines
6.8 KiB
C
276 lines
6.8 KiB
C
/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2002,2003,2004,2005,2006,2007,2008,2009,2013 Free Software Foundation, Inc.
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*
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* GRUB is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* GRUB is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <grub/kernel.h>
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#include <grub/mm.h>
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#include <grub/machine/time.h>
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#include <grub/machine/memory.h>
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#include <grub/machine/console.h>
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#include <grub/offsets.h>
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#include <grub/types.h>
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#include <grub/err.h>
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#include <grub/dl.h>
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#include <grub/misc.h>
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#include <grub/loader.h>
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#include <grub/env.h>
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#include <grub/cache.h>
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#include <grub/time.h>
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#include <grub/symbol.h>
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#include <grub/cpu/io.h>
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#include <grub/cpu/floppy.h>
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#include <grub/cpu/tsc.h>
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#include <grub/machine/kernel.h>
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#include <grub/pci.h>
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extern grub_uint8_t _start[];
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extern grub_uint8_t _end[];
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extern grub_uint8_t _edata[];
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void __attribute__ ((noreturn))
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grub_exit (void)
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{
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/* We can't use grub_fatal() in this function. This would create an infinite
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loop, since grub_fatal() calls grub_abort() which in turn calls grub_exit(). */
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while (1)
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grub_cpu_idle ();
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}
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grub_addr_t grub_modbase;
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/* Helper for grub_machine_init. */
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static int
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heap_init (grub_uint64_t addr, grub_uint64_t size, grub_memory_type_t type,
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void *data __attribute__ ((unused)))
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{
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grub_uint64_t begin = addr, end = addr + size;
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#if GRUB_CPU_SIZEOF_VOID_P == 4
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/* Restrict ourselves to 32-bit memory space. */
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if (begin > GRUB_ULONG_MAX)
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return 0;
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if (end > GRUB_ULONG_MAX)
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end = GRUB_ULONG_MAX;
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#endif
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if (type != GRUB_MEMORY_AVAILABLE)
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return 0;
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/* Avoid the lower memory. */
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if (begin < GRUB_MEMORY_MACHINE_LOWER_SIZE)
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begin = GRUB_MEMORY_MACHINE_LOWER_SIZE;
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if (end <= begin)
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return 0;
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grub_mm_init_region ((void *) (grub_addr_t) begin, (grub_size_t) (end - begin));
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return 0;
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}
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struct resource
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{
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grub_pci_device_t dev;
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grub_size_t size;
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unsigned type:4;
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unsigned bar:3;
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};
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struct iterator_ctx
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{
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struct resource *resources;
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grub_size_t nresources;
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};
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/* We don't support bridges, so can't have more than 32 devices. */
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#define MAX_DEVICES 32
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static int
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find_resources (grub_pci_device_t dev,
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grub_pci_id_t pciid __attribute__ ((unused)),
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void *data)
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{
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struct iterator_ctx *ctx = data;
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int bar;
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if (ctx->nresources >= MAX_DEVICES * 6)
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return 1;
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for (bar = 0; bar < 6; bar++)
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{
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grub_pci_address_t addr;
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grub_uint32_t ones, zeros, mask;
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struct resource *res;
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addr = grub_pci_make_address (dev, GRUB_PCI_REG_ADDRESS_REG0
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+ 4 * bar);
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grub_pci_write (addr, 0xffffffff);
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grub_pci_read (addr);
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ones = grub_pci_read (addr);
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grub_pci_write (addr, 0);
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grub_pci_read (addr);
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zeros = grub_pci_read (addr);
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if (ones == zeros)
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continue;
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res = &ctx->resources[ctx->nresources++];
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if ((zeros & GRUB_PCI_ADDR_SPACE_MASK) == GRUB_PCI_ADDR_SPACE_IO)
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mask = GRUB_PCI_ADDR_SPACE_MASK;
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else
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mask = (GRUB_PCI_ADDR_MEM_TYPE_MASK | GRUB_PCI_ADDR_SPACE_MASK | GRUB_PCI_ADDR_MEM_PREFETCH);
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res->type = ones & mask;
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res->dev = dev;
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res->bar = bar;
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res->size = (~((zeros ^ ones)) | mask) + 1;
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if ((zeros & (GRUB_PCI_ADDR_MEM_TYPE_MASK | GRUB_PCI_ADDR_SPACE_MASK))
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== (GRUB_PCI_ADDR_SPACE_MEMORY | GRUB_PCI_ADDR_MEM_TYPE_64))
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bar++;
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}
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return 0;
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}
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static int
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enable_cards (grub_pci_device_t dev,
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grub_pci_id_t pciid __attribute__ ((unused)),
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void *data __attribute__ ((unused)))
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{
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grub_uint16_t cmd = 0;
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grub_pci_address_t addr;
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grub_uint32_t class;
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int bar;
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for (bar = 0; bar < 6; bar++)
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{
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grub_uint32_t val;
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addr = grub_pci_make_address (dev, GRUB_PCI_REG_ADDRESS_REG0
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+ 4 * bar);
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val = grub_pci_read (addr);
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if (!val)
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continue;
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if ((val & GRUB_PCI_ADDR_SPACE_MASK) == GRUB_PCI_ADDR_SPACE_IO)
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cmd |= GRUB_PCI_COMMAND_IO_ENABLED;
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else
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cmd |= GRUB_PCI_COMMAND_MEM_ENABLED;
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}
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class = (grub_pci_read (addr) >> 16) & 0xffff;
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if (class == GRUB_PCI_CLASS_SUBCLASS_VGA)
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cmd |= GRUB_PCI_COMMAND_IO_ENABLED
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| GRUB_PCI_COMMAND_MEM_ENABLED;
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if (class == GRUB_PCI_CLASS_SUBCLASS_USB)
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return 0;
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addr = grub_pci_make_address (dev, GRUB_PCI_REG_COMMAND);
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grub_pci_write (addr, cmd);
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return 0;
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}
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static void
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grub_pci_assign_addresses (void)
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{
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struct iterator_ctx ctx;
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{
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struct resource resources[MAX_DEVICES * 6];
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int done;
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unsigned i;
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ctx.nresources = 0;
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ctx.resources = resources;
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grub_uint32_t memptr = 0xf0000000;
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grub_uint16_t ioptr = 0x1000;
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grub_pci_iterate (find_resources, &ctx);
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/* FIXME: do we need a better sort here? */
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do
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{
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done = 0;
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for (i = 0; i + 1 < ctx.nresources; i++)
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if (resources[i].size < resources[i+1].size)
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{
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struct resource t;
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t = resources[i];
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resources[i] = resources[i+1];
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resources[i+1] = t;
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done = 1;
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}
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}
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while (done);
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for (i = 0; i < ctx.nresources; i++)
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{
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grub_pci_address_t addr;
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addr = grub_pci_make_address (resources[i].dev,
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GRUB_PCI_REG_ADDRESS_REG0
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+ 4 * resources[i].bar);
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if ((resources[i].type & GRUB_PCI_ADDR_SPACE_MASK)
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== GRUB_PCI_ADDR_SPACE_IO)
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{
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grub_pci_write (addr, ioptr | resources[i].type);
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ioptr += resources[i].size;
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}
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else
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{
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grub_pci_write (addr, memptr | resources[i].type);
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memptr += resources[i].size;
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if ((resources[i].type & (GRUB_PCI_ADDR_MEM_TYPE_MASK
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| GRUB_PCI_ADDR_SPACE_MASK))
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== (GRUB_PCI_ADDR_SPACE_MEMORY | GRUB_PCI_ADDR_MEM_TYPE_64))
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{
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addr = grub_pci_make_address (resources[i].dev,
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GRUB_PCI_REG_ADDRESS_REG0
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+ 4 * resources[i].bar + 4);
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grub_pci_write (addr, 0);
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}
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}
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}
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grub_pci_iterate (enable_cards, NULL);
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}
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}
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void
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grub_machine_init (void)
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{
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grub_modbase = grub_core_entry_addr + (_edata - _start);
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grub_pci_assign_addresses ();
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grub_qemu_init_cirrus ();
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grub_vga_text_init ();
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grub_machine_mmap_init ();
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grub_machine_mmap_iterate (heap_init, NULL);
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grub_tsc_init ();
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}
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void
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grub_machine_get_bootlocation (char **device __attribute__ ((unused)),
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char **path __attribute__ ((unused)))
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{
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}
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void
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grub_machine_fini (int flags)
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{
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if (flags & GRUB_LOADER_FLAG_NORETURN)
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grub_vga_text_fini ();
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grub_stop_floppy ();
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}
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