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-rw-r--r--grub-core/mmap/mmap.c554
1 files changed, 554 insertions, 0 deletions
diff --git a/grub-core/mmap/mmap.c b/grub-core/mmap/mmap.c
new file mode 100644
index 0000000..c8c8312
--- /dev/null
+++ b/grub-core/mmap/mmap.c
@@ -0,0 +1,554 @@
+/* Mmap management. */
+/*
+ * GRUB -- GRand Unified Bootloader
+ * Copyright (C) 2009 Free Software Foundation, Inc.
+ *
+ * GRUB is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * GRUB is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with GRUB. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <grub/memory.h>
+#include <grub/machine/memory.h>
+#include <grub/err.h>
+#include <grub/lockdown.h>
+#include <grub/misc.h>
+#include <grub/mm.h>
+#include <grub/command.h>
+#include <grub/dl.h>
+#include <grub/i18n.h>
+
+GRUB_MOD_LICENSE ("GPLv3+");
+
+#ifndef GRUB_MMAP_REGISTER_BY_FIRMWARE
+
+struct grub_mmap_region *grub_mmap_overlays = 0;
+static int curhandle = 1;
+
+#endif
+
+static int current_priority = 1;
+
+/* Scanline events. */
+struct grub_mmap_scan
+{
+ /* At which memory address. */
+ grub_uint64_t pos;
+ /* 0 = region starts, 1 = region ends. */
+ int type;
+ /* Which type of memory region? */
+ grub_memory_type_t memtype;
+ /* Priority. 0 means coming from firmware. */
+ int priority;
+};
+
+/* Context for grub_mmap_iterate. */
+struct grub_mmap_iterate_ctx
+{
+ struct grub_mmap_scan *scanline_events;
+ int i;
+};
+
+/* Helper for grub_mmap_iterate. */
+static int
+count_hook (grub_uint64_t addr __attribute__ ((unused)),
+ grub_uint64_t size __attribute__ ((unused)),
+ grub_memory_type_t type __attribute__ ((unused)), void *data)
+{
+ int *mmap_num = data;
+
+ (*mmap_num)++;
+ return 0;
+}
+
+/* Helper for grub_mmap_iterate. */
+static int
+fill_hook (grub_uint64_t addr, grub_uint64_t size, grub_memory_type_t type,
+ void *data)
+{
+ struct grub_mmap_iterate_ctx *ctx = data;
+
+ if (type == GRUB_MEMORY_HOLE)
+ {
+ grub_dprintf ("mmap", "Unknown memory type %d. Assuming unusable\n",
+ type);
+ type = GRUB_MEMORY_RESERVED;
+ }
+
+ ctx->scanline_events[ctx->i].pos = addr;
+ ctx->scanline_events[ctx->i].type = 0;
+ ctx->scanline_events[ctx->i].memtype = type;
+ ctx->scanline_events[ctx->i].priority = 0;
+
+ ctx->i++;
+
+ ctx->scanline_events[ctx->i].pos = addr + size;
+ ctx->scanline_events[ctx->i].type = 1;
+ ctx->scanline_events[ctx->i].memtype = type;
+ ctx->scanline_events[ctx->i].priority = 0;
+ ctx->i++;
+
+ return 0;
+}
+
+struct mm_list
+{
+ struct mm_list *next;
+ grub_memory_type_t val;
+ int present;
+};
+
+grub_err_t
+grub_mmap_iterate (grub_memory_hook_t hook, void *hook_data)
+{
+ /* This function resolves overlapping regions and sorts the memory map.
+ It uses scanline (sweeping) algorithm.
+ */
+ struct grub_mmap_iterate_ctx ctx;
+ int i, done;
+
+ struct grub_mmap_scan t;
+
+ /* Previous scanline event. */
+ grub_uint64_t lastaddr;
+ int lasttype;
+ /* Current scanline event. */
+ int curtype;
+ /* How many regions of given type/priority overlap at current location? */
+ /* Normally there shouldn't be more than one region per priority but be robust. */
+ struct mm_list *present;
+ /* Number of mmap chunks. */
+ int mmap_num;
+
+#ifndef GRUB_MMAP_REGISTER_BY_FIRMWARE
+ struct grub_mmap_region *cur;
+#endif
+
+ mmap_num = 0;
+
+#ifndef GRUB_MMAP_REGISTER_BY_FIRMWARE
+ for (cur = grub_mmap_overlays; cur; cur = cur->next)
+ mmap_num++;
+#endif
+
+ grub_machine_mmap_iterate (count_hook, &mmap_num);
+
+ /* Initialize variables. */
+ ctx.scanline_events = (struct grub_mmap_scan *)
+ grub_calloc (mmap_num, sizeof (struct grub_mmap_scan) * 2);
+
+ present = grub_calloc (current_priority, sizeof (present[0]));
+
+ if (! ctx.scanline_events || !present)
+ {
+ grub_free (ctx.scanline_events);
+ grub_free (present);
+ return grub_errno;
+ }
+
+ ctx.i = 0;
+#ifndef GRUB_MMAP_REGISTER_BY_FIRMWARE
+ /* Register scanline events. */
+ for (cur = grub_mmap_overlays; cur; cur = cur->next)
+ {
+ ctx.scanline_events[ctx.i].pos = cur->start;
+ ctx.scanline_events[ctx.i].type = 0;
+ ctx.scanline_events[ctx.i].memtype = cur->type;
+ ctx.scanline_events[ctx.i].priority = cur->priority;
+ ctx.i++;
+
+ ctx.scanline_events[ctx.i].pos = cur->end;
+ ctx.scanline_events[ctx.i].type = 1;
+ ctx.scanline_events[ctx.i].memtype = cur->type;
+ ctx.scanline_events[ctx.i].priority = cur->priority;
+ ctx.i++;
+ }
+#endif /* ! GRUB_MMAP_REGISTER_BY_FIRMWARE */
+
+ grub_machine_mmap_iterate (fill_hook, &ctx);
+
+ /* Primitive bubble sort. It has complexity O(n^2) but since we're
+ unlikely to have more than 100 chunks it's probably one of the
+ fastest for one purpose. */
+ done = 1;
+ while (done)
+ {
+ done = 0;
+ for (i = 0; i < 2 * mmap_num - 1; i++)
+ if (ctx.scanline_events[i + 1].pos < ctx.scanline_events[i].pos
+ || (ctx.scanline_events[i + 1].pos == ctx.scanline_events[i].pos
+ && ctx.scanline_events[i + 1].type == 0
+ && ctx.scanline_events[i].type == 1))
+ {
+ t = ctx.scanline_events[i + 1];
+ ctx.scanline_events[i + 1] = ctx.scanline_events[i];
+ ctx.scanline_events[i] = t;
+ done = 1;
+ }
+ }
+
+ lastaddr = ctx.scanline_events[0].pos;
+ lasttype = ctx.scanline_events[0].memtype;
+ for (i = 0; i < 2 * mmap_num; i++)
+ {
+ /* Process event. */
+ if (ctx.scanline_events[i].type)
+ {
+ if (present[ctx.scanline_events[i].priority].present)
+ {
+ if (present[ctx.scanline_events[i].priority].val == ctx.scanline_events[i].memtype)
+ {
+ if (present[ctx.scanline_events[i].priority].next)
+ {
+ struct mm_list *p = present[ctx.scanline_events[i].priority].next;
+ present[ctx.scanline_events[i].priority] = *p;
+ grub_free (p);
+ }
+ else
+ {
+ present[ctx.scanline_events[i].priority].present = 0;
+ }
+ }
+ else
+ {
+ struct mm_list **q = &(present[ctx.scanline_events[i].priority].next), *p;
+ for (; *q; q = &((*q)->next))
+ if ((*q)->val == ctx.scanline_events[i].memtype)
+ {
+ p = *q;
+ *q = p->next;
+ grub_free (p);
+ break;
+ }
+ }
+ }
+ }
+ else
+ {
+ if (!present[ctx.scanline_events[i].priority].present)
+ {
+ present[ctx.scanline_events[i].priority].present = 1;
+ present[ctx.scanline_events[i].priority].val = ctx.scanline_events[i].memtype;
+ }
+ else
+ {
+ struct mm_list *n = grub_malloc (sizeof (*n));
+ n->val = ctx.scanline_events[i].memtype;
+ n->present = 1;
+ n->next = present[ctx.scanline_events[i].priority].next;
+ present[ctx.scanline_events[i].priority].next = n;
+ }
+ }
+
+ /* Determine current region type. */
+ curtype = -1;
+ {
+ int k;
+ for (k = current_priority - 1; k >= 0; k--)
+ if (present[k].present)
+ {
+ curtype = present[k].val;
+ break;
+ }
+ }
+
+ /* Announce region to the hook if necessary. */
+ if ((curtype == -1 || curtype != lasttype)
+ && lastaddr != ctx.scanline_events[i].pos
+ && lasttype != -1
+ && lasttype != GRUB_MEMORY_HOLE
+ && hook (lastaddr, ctx.scanline_events[i].pos - lastaddr, lasttype,
+ hook_data))
+ {
+ grub_free (ctx.scanline_events);
+ grub_free (present);
+ return GRUB_ERR_NONE;
+ }
+
+ /* Update last values if necessary. */
+ if (curtype == -1 || curtype != lasttype)
+ {
+ lasttype = curtype;
+ lastaddr = ctx.scanline_events[i].pos;
+ }
+ }
+
+ grub_free (ctx.scanline_events);
+ grub_free (present);
+ return GRUB_ERR_NONE;
+}
+
+#ifndef GRUB_MMAP_REGISTER_BY_FIRMWARE
+int
+grub_mmap_register (grub_uint64_t start, grub_uint64_t size, int type)
+{
+ struct grub_mmap_region *cur;
+
+ grub_dprintf ("mmap", "registering\n");
+
+ cur = (struct grub_mmap_region *)
+ grub_malloc (sizeof (struct grub_mmap_region));
+ if (! cur)
+ return 0;
+
+ cur->next = grub_mmap_overlays;
+ cur->start = start;
+ cur->end = start + size;
+ cur->type = type;
+ cur->handle = curhandle++;
+ cur->priority = current_priority++;
+ grub_mmap_overlays = cur;
+
+ if (grub_machine_mmap_register (start, size, type, curhandle))
+ {
+ grub_mmap_overlays = cur->next;
+ grub_free (cur);
+ return 0;
+ }
+
+ return cur->handle;
+}
+
+grub_err_t
+grub_mmap_unregister (int handle)
+{
+ struct grub_mmap_region *cur, *prev;
+
+ for (cur = grub_mmap_overlays, prev = 0; cur; prev = cur, cur = cur->next)
+ if (handle == cur->handle)
+ {
+ grub_err_t err;
+ err = grub_machine_mmap_unregister (handle);
+ if (err)
+ return err;
+
+ if (prev)
+ prev->next = cur->next;
+ else
+ grub_mmap_overlays = cur->next;
+ grub_free (cur);
+ return GRUB_ERR_NONE;
+ }
+ return grub_error (GRUB_ERR_BUG, "mmap overlay not found");
+}
+
+#endif /* ! GRUB_MMAP_REGISTER_BY_FIRMWARE */
+
+#define CHUNK_SIZE 0x400
+
+struct badram_entry {
+ grub_uint64_t addr, mask;
+};
+
+static inline grub_uint64_t
+fill_mask (struct badram_entry *entry, grub_uint64_t iterator)
+{
+ int i, j;
+ grub_uint64_t ret = (entry->addr & entry->mask);
+
+ /* Find first fixed bit. */
+ for (i = 0; i < 64; i++)
+ if ((entry->mask & (1ULL << i)) != 0)
+ break;
+ j = 0;
+ for (; i < 64; i++)
+ if ((entry->mask & (1ULL << i)) == 0)
+ {
+ if ((iterator & (1ULL << j)) != 0)
+ ret |= 1ULL << i;
+ j++;
+ }
+ return ret;
+}
+
+/* Helper for grub_cmd_badram. */
+static int
+badram_iter (grub_uint64_t addr, grub_uint64_t size,
+ grub_memory_type_t type __attribute__ ((unused)), void *data)
+{
+ struct badram_entry *entry = data;
+ grub_uint64_t iterator, low, high, cur;
+ int tail, var;
+ int i;
+ grub_dprintf ("badram", "hook %llx+%llx\n", (unsigned long long) addr,
+ (unsigned long long) size);
+
+ /* How many trailing zeros? */
+ for (tail = 0; ! (entry->mask & (1ULL << tail)); tail++);
+
+ /* How many zeros in mask? */
+ var = 0;
+ for (i = 0; i < 64; i++)
+ if (! (entry->mask & (1ULL << i)))
+ var++;
+
+ if (fill_mask (entry, 0) >= addr)
+ iterator = 0;
+ else
+ {
+ low = 0;
+ high = ~0ULL;
+ /* Find starting value. Keep low and high such that
+ fill_mask (low) < addr and fill_mask (high) >= addr;
+ */
+ while (high - low > 1)
+ {
+ cur = (low + high) / 2;
+ if (fill_mask (entry, cur) >= addr)
+ high = cur;
+ else
+ low = cur;
+ }
+ iterator = high;
+ }
+
+ for (; iterator < (1ULL << (var - tail))
+ && (cur = fill_mask (entry, iterator)) < addr + size;
+ iterator++)
+ {
+ grub_dprintf ("badram", "%llx (size %llx) is a badram range\n",
+ (unsigned long long) cur, (1ULL << tail));
+ grub_mmap_register (cur, (1ULL << tail), GRUB_MEMORY_HOLE);
+ }
+ return 0;
+}
+
+static grub_err_t
+grub_cmd_badram (grub_command_t cmd __attribute__ ((unused)),
+ int argc, char **args)
+{
+ const char *str;
+ struct badram_entry entry;
+
+ if (argc != 1)
+ return grub_error (GRUB_ERR_BAD_ARGUMENT, N_("one argument expected"));
+
+ grub_dprintf ("badram", "executing badram\n");
+
+ str = args[0];
+
+ while (1)
+ {
+ /* Parse address and mask. */
+ entry.addr = grub_strtoull (str, &str, 16);
+ if (*str == ',')
+ str++;
+ entry.mask = grub_strtoull (str, &str, 16);
+ if (*str == ',')
+ str++;
+
+ if (grub_errno == GRUB_ERR_BAD_NUMBER)
+ {
+ grub_errno = 0;
+ return GRUB_ERR_NONE;
+ }
+
+ /* When part of a page is tainted, we discard the whole of it. There's
+ no point in providing sub-page chunks. */
+ entry.mask &= ~(CHUNK_SIZE - 1);
+
+ grub_dprintf ("badram", "badram %llx:%llx\n",
+ (unsigned long long) entry.addr,
+ (unsigned long long) entry.mask);
+
+ grub_mmap_iterate (badram_iter, &entry);
+ }
+}
+
+static grub_uint64_t
+parsemem (const char *str)
+{
+ grub_uint64_t ret;
+ const char *ptr;
+
+ ret = grub_strtoul (str, &ptr, 0);
+
+ switch (*ptr)
+ {
+ case 'K':
+ return ret << 10;
+ case 'M':
+ return ret << 20;
+ case 'G':
+ return ret << 30;
+ case 'T':
+ return ret << 40;
+ }
+ return ret;
+}
+
+struct cutmem_range {
+ grub_uint64_t from, to;
+};
+
+/* Helper for grub_cmd_cutmem. */
+static int
+cutmem_iter (grub_uint64_t addr, grub_uint64_t size,
+ grub_memory_type_t type __attribute__ ((unused)), void *data)
+{
+ struct cutmem_range *range = data;
+ grub_uint64_t end = addr + size;
+
+ if (addr <= range->from)
+ addr = range->from;
+ if (end >= range->to)
+ end = range->to;
+
+ if (end <= addr)
+ return 0;
+
+ grub_mmap_register (addr, end - addr, GRUB_MEMORY_HOLE);
+ return 0;
+}
+
+static grub_err_t
+grub_cmd_cutmem (grub_command_t cmd __attribute__ ((unused)),
+ int argc, char **args)
+{
+ struct cutmem_range range;
+
+ if (argc != 2)
+ return grub_error (GRUB_ERR_BAD_ARGUMENT, N_("two arguments expected"));
+
+ range.from = parsemem (args[0]);
+ if (grub_errno)
+ return grub_errno;
+
+ range.to = parsemem (args[1]);
+ if (grub_errno)
+ return grub_errno;
+
+ grub_mmap_iterate (cutmem_iter, &range);
+
+ return GRUB_ERR_NONE;
+}
+
+static grub_command_t cmd, cmd_cut;
+
+
+GRUB_MOD_INIT(mmap)
+{
+ cmd = grub_register_command_lockdown ("badram", grub_cmd_badram,
+ N_("ADDR1,MASK1[,ADDR2,MASK2[,...]]"),
+ N_("Declare memory regions as faulty (badram)."));
+ cmd_cut = grub_register_command_lockdown ("cutmem", grub_cmd_cutmem,
+ N_("FROM[K|M|G] TO[K|M|G]"),
+ N_("Remove any memory regions in specified range."));
+
+}
+
+GRUB_MOD_FINI(mmap)
+{
+ grub_unregister_command (cmd);
+ grub_unregister_command (cmd_cut);
+}
+
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