#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>
#endif
-grub_err_t
-grub_mmap_iterate (grub_memory_hook_t hook)
+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.
*/
- /* If same page is used by multiple types it's resolved
- according to priority:
- 1 - free memory
- 2 - memory usable by firmware-aware code
- 3 - unusable memory
- 4 - a range deliberately empty
- */
- int priority[] =
- {
- [GRUB_MEMORY_AVAILABLE] = 1,
- [GRUB_MEMORY_RESERVED] = 3,
- [GRUB_MEMORY_ACPI] = 2,
- [GRUB_MEMORY_CODE] = 3,
- [GRUB_MEMORY_NVS] = 3,
- [GRUB_MEMORY_HOLE] = 4,
- };
-
+ struct grub_mmap_iterate_ctx ctx;
int i, done;
- /* 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? */
- int memtype;
- };
- struct grub_mmap_scan *scanline_events;
struct grub_mmap_scan t;
/* Previous scanline event. */
int lasttype;
/* Current scanline event. */
int curtype;
- /* How many regions of given type overlap at current location? */
- int present[ARRAY_SIZE (priority)];
+ /* 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;
struct grub_mmap_region *cur;
#endif
- auto int NESTED_FUNC_ATTR count_hook (grub_uint64_t, grub_uint64_t,
- grub_uint32_t);
- int NESTED_FUNC_ATTR count_hook (grub_uint64_t addr __attribute__ ((unused)),
- grub_uint64_t size __attribute__ ((unused)),
- grub_memory_type_t type __attribute__ ((unused)))
- {
- mmap_num++;
- return 0;
- }
-
- auto int NESTED_FUNC_ATTR fill_hook (grub_uint64_t, grub_uint64_t,
- grub_uint32_t);
- int NESTED_FUNC_ATTR fill_hook (grub_uint64_t addr,
- grub_uint64_t size,
- grub_memory_type_t type)
- {
- scanline_events[i].pos = addr;
- scanline_events[i].type = 0;
- if (type < ARRAY_SIZE (priority) && priority[type])
- scanline_events[i].memtype = type;
- else
- {
- grub_dprintf ("mmap", "Unknown memory type %d. Assuming unusable\n",
- type);
- scanline_events[i].memtype = GRUB_MEMORY_RESERVED;
- }
- i++;
-
- scanline_events[i].pos = addr + size;
- scanline_events[i].type = 1;
- scanline_events[i].memtype = scanline_events[i - 1].memtype;
- i++;
-
- return 0;
- }
-
mmap_num = 0;
#ifndef GRUB_MMAP_REGISTER_BY_FIRMWARE
mmap_num++;
#endif
- grub_machine_mmap_iterate (count_hook);
+ grub_machine_mmap_iterate (count_hook, &mmap_num);
/* Initialize variables. */
- grub_memset (present, 0, sizeof (present));
- scanline_events = (struct grub_mmap_scan *)
- grub_malloc (sizeof (struct grub_mmap_scan) * 2 * mmap_num);
+ 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 (! scanline_events)
+ if (! ctx.scanline_events || !present)
{
- return grub_error (GRUB_ERR_OUT_OF_MEMORY,
- "couldn't allocate space for new memory map");
+ grub_free (ctx.scanline_events);
+ grub_free (present);
+ return grub_errno;
}
- i = 0;
+ ctx.i = 0;
#ifndef GRUB_MMAP_REGISTER_BY_FIRMWARE
/* Register scanline events. */
for (cur = grub_mmap_overlays; cur; cur = cur->next)
{
- scanline_events[i].pos = cur->start;
- scanline_events[i].type = 0;
- if (cur->type < ARRAY_SIZE (priority) && priority[cur->type])
- scanline_events[i].memtype = cur->type;
- else
- scanline_events[i].memtype = GRUB_MEMORY_RESERVED;
- i++;
-
- scanline_events[i].pos = cur->end;
- scanline_events[i].type = 1;
- scanline_events[i].memtype = scanline_events[i - 1].memtype;
- i++;
+ 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);
+ 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
{
done = 0;
for (i = 0; i < 2 * mmap_num - 1; i++)
- if (scanline_events[i + 1].pos < scanline_events[i].pos
- || (scanline_events[i + 1].pos == scanline_events[i].pos
- && scanline_events[i + 1].type == 0
- && scanline_events[i].type == 1))
+ 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 = scanline_events[i + 1];
- scanline_events[i + 1] = scanline_events[i];
- scanline_events[i] = t;
+ t = ctx.scanline_events[i + 1];
+ ctx.scanline_events[i + 1] = ctx.scanline_events[i];
+ ctx.scanline_events[i] = t;
done = 1;
}
}
- lastaddr = scanline_events[0].pos;
- lasttype = scanline_events[0].memtype;
+ lastaddr = ctx.scanline_events[0].pos;
+ lasttype = ctx.scanline_events[0].memtype;
for (i = 0; i < 2 * mmap_num; i++)
{
- unsigned k;
/* Process event. */
- if (scanline_events[i].type)
- present[scanline_events[i].memtype]--;
+ 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
- present[scanline_events[i].memtype]++;
+ {
+ 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;
- for (k = 0; k < ARRAY_SIZE (priority); k++)
- if (present[k] && (curtype == -1 || priority[k] > priority[curtype]))
- curtype = k;
+ {
+ 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 != scanline_events[i].pos
+ && lastaddr != ctx.scanline_events[i].pos
&& lasttype != -1
&& lasttype != GRUB_MEMORY_HOLE
- && hook (lastaddr, scanline_events[i].pos - lastaddr, lasttype))
+ && hook (lastaddr, ctx.scanline_events[i].pos - lastaddr, lasttype,
+ hook_data))
{
- grub_free (scanline_events);
+ grub_free (ctx.scanline_events);
+ grub_free (present);
return GRUB_ERR_NONE;
}
if (curtype == -1 || curtype != lasttype)
{
lasttype = curtype;
- lastaddr = scanline_events[i].pos;
+ lastaddr = ctx.scanline_events[i].pos;
}
}
- grub_free (scanline_events);
+ grub_free (ctx.scanline_events);
+ grub_free (present);
return GRUB_ERR_NONE;
}
cur = (struct grub_mmap_region *)
grub_malloc (sizeof (struct grub_mmap_region));
if (! cur)
- {
- grub_error (GRUB_ERR_OUT_OF_MEMORY,
- "couldn't allocate memory map overlay");
- return 0;
- }
+ 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))
{
struct grub_mmap_region *cur, *prev;
- for (cur = grub_mmap_overlays, prev = 0; cur; prev= cur, cur = cur->next)
+ for (cur = grub_mmap_overlays, prev = 0; cur; prev = cur, cur = cur->next)
if (handle == cur->handle)
{
grub_err_t err;
- if ((err = grub_machine_mmap_unregister (handle)))
+ err = grub_machine_mmap_unregister (handle);
+ if (err)
return err;
if (prev)
grub_free (cur);
return GRUB_ERR_NONE;
}
- return grub_error (GRUB_ERR_BAD_ARGUMENT, "mmap overlay not found");
+ 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 (grub_uint64_t addr, grub_uint64_t mask, grub_uint64_t iterator)
+fill_mask (struct badram_entry *entry, grub_uint64_t iterator)
{
int i, j;
- grub_uint64_t ret = (addr & mask);
+ grub_uint64_t ret = (entry->addr & entry->mask);
/* Find first fixed bit. */
for (i = 0; i < 64; i++)
- if ((mask & (1ULL << i)) != 0)
+ if ((entry->mask & (1ULL << i)) != 0)
break;
j = 0;
for (; i < 64; i++)
- if ((mask & (1ULL << i)) == 0)
+ if ((entry->mask & (1ULL << i)) == 0)
{
if ((iterator & (1ULL << j)) != 0)
ret |= 1ULL << i;
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)
{
- char * str;
- grub_uint64_t badaddr, badmask;
-
- auto int NESTED_FUNC_ATTR hook (grub_uint64_t, grub_uint64_t,
- grub_memory_type_t);
- int NESTED_FUNC_ATTR hook (grub_uint64_t addr,
- grub_uint64_t size,
- grub_memory_type_t type __attribute__ ((unused)))
- {
- 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; ! (badmask & (1ULL << tail)); tail++);
-
- /* How many zeros in mask? */
- var = 0;
- for (i = 0; i < 64; i++)
- if (! (badmask & (1ULL << i)))
- var++;
-
- if (fill_mask (badaddr, badmask, 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 (badaddr, badmask, cur) >= addr)
- high = cur;
- else
- low = cur;
- }
- iterator = high;
- }
-
- for (; iterator < (1ULL << (var - tail))
- && (cur = fill_mask (badaddr, badmask, 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;
- }
+ const char *str;
+ struct badram_entry entry;
if (argc != 1)
- return grub_error (GRUB_ERR_BAD_ARGUMENT, "badram string required");
+ return grub_error (GRUB_ERR_BAD_ARGUMENT, N_("one argument expected"));
grub_dprintf ("badram", "executing badram\n");
while (1)
{
/* Parse address and mask. */
- badaddr = grub_strtoull (str, &str, 16);
+ entry.addr = grub_strtoull (str, &str, 16);
if (*str == ',')
str++;
- badmask = grub_strtoull (str, &str, 16);
+ entry.mask = grub_strtoull (str, &str, 16);
if (*str == ',')
str++;
/* When part of a page is tainted, we discard the whole of it. There's
no point in providing sub-page chunks. */
- badmask &= ~(CHUNK_SIZE - 1);
+ entry.mask &= ~(CHUNK_SIZE - 1);
grub_dprintf ("badram", "badram %llx:%llx\n",
- (unsigned long long) badaddr, (unsigned long long) badmask);
+ (unsigned long long) entry.addr,
+ (unsigned long long) entry.mask);
- grub_mmap_iterate (hook);
+ grub_mmap_iterate (badram_iter, &entry);
}
}
parsemem (const char *str)
{
grub_uint64_t ret;
- char *ptr;
+ const char *ptr;
ret = grub_strtoul (str, &ptr, 0);
return ret;
}
-static grub_err_t
-grub_cmd_cutmem (grub_command_t cmd __attribute__ ((unused)),
- int argc, char **args)
-{
+struct cutmem_range {
grub_uint64_t from, to;
+};
- auto int NESTED_FUNC_ATTR hook (grub_uint64_t, grub_uint64_t,
- grub_memory_type_t);
- int NESTED_FUNC_ATTR hook (grub_uint64_t addr,
- grub_uint64_t size,
- grub_memory_type_t type __attribute__ ((unused)))
- {
- grub_uint64_t end = addr + size;
-
- if (addr <= from)
- addr = from;
- if (end >= to)
- end = 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 (end <= addr)
- return 0;
+ if (addr <= range->from)
+ addr = range->from;
+ if (end >= range->to)
+ end = range->to;
- grub_mmap_register (addr, end - addr, GRUB_MEMORY_HOLE);
+ 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, "argements required");
+ return grub_error (GRUB_ERR_BAD_ARGUMENT, N_("two arguments expected"));
- from = parsemem (args[0]);
+ range.from = parsemem (args[0]);
if (grub_errno)
return grub_errno;
- to = parsemem (args[1]);
+ range.to = parsemem (args[1]);
if (grub_errno)
return grub_errno;
- grub_mmap_iterate (hook);
+ grub_mmap_iterate (cutmem_iter, &range);
return GRUB_ERR_NONE;
}
\f
GRUB_MOD_INIT(mmap)
{
- cmd = grub_register_command ("badram", grub_cmd_badram,
- N_("ADDR1,MASK1[,ADDR2,MASK2[,...]]"),
- N_("Declare memory regions as badram."));
- cmd_cut = grub_register_command ("cutmem", grub_cmd_cutmem,
- N_("FROM[K|M|G] TO[K|M|G]"),
- N_("Remove any memory regions in specified range."));
+ 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."));
}
projects / grub2.git / blobdiff