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authorJames <james.mckenzie@citrix.com>2012-11-16 10:41:01 +0000
committerJames <james.mckenzie@citrix.com>2012-11-16 10:41:01 +0000
commit041d1ea37802bf7178a31a53f96c26efa6b8fb7b (patch)
treec193e84ad1237f25a79d0f6a267722e44c73f56a /grub-core/efiemu/runtime/efiemu.c
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Diffstat (limited to 'grub-core/efiemu/runtime/efiemu.c')
-rw-r--r--grub-core/efiemu/runtime/efiemu.c630
1 files changed, 630 insertions, 0 deletions
diff --git a/grub-core/efiemu/runtime/efiemu.c b/grub-core/efiemu/runtime/efiemu.c
new file mode 100644
index 0000000..7389341
--- /dev/null
+++ b/grub-core/efiemu/runtime/efiemu.c
@@ -0,0 +1,630 @@
+/*
+ * GRUB -- GRand Unified Bootloader
+ * Copyright (C) 2006,2007,2009 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/>.
+ */
+
+/* This is an emulation of EFI runtime services.
+ This allows a more uniform boot on i386 machines.
+ As it emulates only runtime serviceit isn't able
+ to chainload EFI bootloader on non-EFI system (TODO) */
+
+#include <grub/symbol.h>
+#include <grub/types.h>
+#include <grub/efi/api.h>
+#include <grub/efiemu/runtime.h>
+
+grub_efi_status_t
+efiemu_get_time (grub_efi_time_t *time,
+ grub_efi_time_capabilities_t *capabilities);
+grub_efi_status_t
+efiemu_set_time (grub_efi_time_t *time);
+
+grub_efi_status_t
+efiemu_get_wakeup_time (grub_efi_boolean_t *enabled,
+ grub_efi_boolean_t *pending,
+ grub_efi_time_t *time);
+grub_efi_status_t
+efiemu_set_wakeup_time (grub_efi_boolean_t enabled,
+ grub_efi_time_t *time);
+
+#ifdef APPLE_CC
+#define PHYSICAL_ATTRIBUTE __attribute__ ((section("_text-physical, _text-physical")));
+#else
+#define PHYSICAL_ATTRIBUTE __attribute__ ((section(".text-physical")));
+#endif
+
+grub_efi_status_t
+efiemu_set_virtual_address_map (grub_efi_uintn_t memory_map_size,
+ grub_efi_uintn_t descriptor_size,
+ grub_efi_uint32_t descriptor_version,
+ grub_efi_memory_descriptor_t *virtual_map)
+ PHYSICAL_ATTRIBUTE;
+
+grub_efi_status_t
+efiemu_convert_pointer (grub_efi_uintn_t debug_disposition,
+ void **address)
+ PHYSICAL_ATTRIBUTE;
+
+grub_efi_status_t
+efiemu_get_variable (grub_efi_char16_t *variable_name,
+ grub_efi_guid_t *vendor_guid,
+ grub_efi_uint32_t *attributes,
+ grub_efi_uintn_t *data_size,
+ void *data);
+
+grub_efi_status_t
+efiemu_get_next_variable_name (grub_efi_uintn_t *variable_name_size,
+ grub_efi_char16_t *variable_name,
+ grub_efi_guid_t *vendor_guid);
+
+grub_efi_status_t
+efiemu_set_variable (grub_efi_char16_t *variable_name,
+ grub_efi_guid_t *vendor_guid,
+ grub_efi_uint32_t attributes,
+ grub_efi_uintn_t data_size,
+ void *data);
+grub_efi_status_t
+efiemu_get_next_high_monotonic_count (grub_efi_uint32_t *high_count);
+void
+efiemu_reset_system (grub_efi_reset_type_t reset_type,
+ grub_efi_status_t reset_status,
+ grub_efi_uintn_t data_size,
+ grub_efi_char16_t *reset_data);
+
+grub_efi_status_t
+EFI_FUNC (efiemu_set_virtual_address_map) (grub_efi_uintn_t,
+ grub_efi_uintn_t,
+ grub_efi_uint32_t,
+ grub_efi_memory_descriptor_t *)
+ PHYSICAL_ATTRIBUTE;
+grub_efi_status_t
+EFI_FUNC (efiemu_convert_pointer) (grub_efi_uintn_t debug_disposition,
+ void **address)
+ PHYSICAL_ATTRIBUTE;
+static grub_uint32_t
+efiemu_getcrc32 (grub_uint32_t crc, void *buf, int size)
+ PHYSICAL_ATTRIBUTE;
+static void
+init_crc32_table (void)
+ PHYSICAL_ATTRIBUTE;
+static grub_uint32_t
+reflect (grub_uint32_t ref, int len)
+ PHYSICAL_ATTRIBUTE;
+
+/*
+ The log. It's used when examining memory dump
+*/
+static grub_uint8_t loge[1000] = "EFIEMULOG";
+static int logn = 9;
+#define LOG(x) { if (logn<900) loge[logn++]=x; }
+
+/* Interface with grub */
+extern grub_uint8_t efiemu_ptv_relocated;
+struct grub_efi_runtime_services efiemu_runtime_services;
+struct grub_efi_system_table efiemu_system_table;
+extern struct grub_efiemu_ptv_rel efiemu_ptv_relloc[];
+extern grub_uint8_t efiemu_variables[];
+extern grub_uint32_t efiemu_varsize;
+extern grub_uint32_t efiemu_high_monotonic_count;
+extern grub_int16_t efiemu_time_zone;
+extern grub_uint8_t efiemu_time_daylight;
+extern grub_uint32_t efiemu_time_accuracy;
+
+/* Some standard functions because we need to be standalone */
+static void
+efiemu_memcpy (void *to, void *from, int count)
+{
+ int i;
+ for (i = 0; i < count; i++)
+ ((grub_uint8_t *) to)[i] = ((grub_uint8_t *) from)[i];
+}
+
+static int
+efiemu_str16equal (grub_uint16_t *a, grub_uint16_t *b)
+{
+ grub_uint16_t *ptr1, *ptr2;
+ for (ptr1=a,ptr2=b; *ptr1 && *ptr2 == *ptr1; ptr1++, ptr2++);
+ return *ptr2 == *ptr1;
+}
+
+static grub_size_t
+efiemu_str16len (grub_uint16_t *a)
+{
+ grub_uint16_t *ptr1;
+ for (ptr1 = a; *ptr1; ptr1++);
+ return ptr1 - a;
+}
+
+static int
+efiemu_memequal (void *a, void *b, grub_size_t n)
+{
+ grub_uint8_t *ptr1, *ptr2;
+ for (ptr1 = (grub_uint8_t *) a, ptr2 = (grub_uint8_t *)b;
+ ptr1 < (grub_uint8_t *)a + n && *ptr2 == *ptr1; ptr1++, ptr2++);
+ return ptr1 == a + n;
+}
+
+static void
+efiemu_memset (grub_uint8_t *a, grub_uint8_t b, grub_size_t n)
+{
+ grub_uint8_t *ptr1;
+ for (ptr1=a; ptr1 < a + n; ptr1++)
+ *ptr1 = b;
+}
+
+static inline void
+write_cmos (grub_uint8_t addr, grub_uint8_t val)
+{
+ __asm__ __volatile__ ("outb %%al,$0x70\n"
+ "mov %%cl, %%al\n"
+ "outb %%al,$0x71": :"a" (addr), "c" (val));
+}
+
+static inline grub_uint8_t
+read_cmos (grub_uint8_t addr)
+{
+ grub_uint8_t ret;
+ __asm__ __volatile__ ("outb %%al, $0x70\n"
+ "inb $0x71, %%al": "=a"(ret) :"a" (addr));
+ return ret;
+}
+
+/* Needed by some gcc versions */
+int __stack_chk_fail ()
+{
+ return 0;
+}
+
+/* The function that implement runtime services as specified in
+ EFI specification */
+static inline grub_uint8_t
+bcd_to_hex (grub_uint8_t in)
+{
+ return 10 * ((in & 0xf0) >> 4) + (in & 0x0f);
+}
+
+grub_efi_status_t
+EFI_FUNC (efiemu_get_time) (grub_efi_time_t *time,
+ grub_efi_time_capabilities_t *capabilities)
+{
+ LOG ('a');
+ grub_uint8_t state;
+ state = read_cmos (0xb);
+ if (!(state & (1 << 2)))
+ {
+ time->year = 2000 + bcd_to_hex (read_cmos (0x9));
+ time->month = bcd_to_hex (read_cmos (0x8));
+ time->day = bcd_to_hex (read_cmos (0x7));
+ time->hour = bcd_to_hex (read_cmos (0x4));
+ if (time->hour >= 81)
+ time->hour -= 80 - 12;
+ if (time->hour == 24)
+ time->hour = 0;
+ time->minute = bcd_to_hex (read_cmos (0x2));
+ time->second = bcd_to_hex (read_cmos (0x0));
+ }
+ else
+ {
+ time->year = 2000 + read_cmos (0x9);
+ time->month = read_cmos (0x8);
+ time->day = read_cmos (0x7);
+ time->hour = read_cmos (0x4);
+ if (time->hour >= 0x81)
+ time->hour -= 0x80 - 12;
+ if (time->hour == 24)
+ time->hour = 0;
+ time->minute = read_cmos (0x2);
+ time->second = read_cmos (0x0);
+ }
+ time->nanosecond = 0;
+ time->pad1 = 0;
+ time->pad2 = 0;
+ time->time_zone = efiemu_time_zone;
+ time->daylight = efiemu_time_daylight;
+ capabilities->resolution = 1;
+ capabilities->accuracy = efiemu_time_accuracy;
+ capabilities->sets_to_zero = 0;
+ return GRUB_EFI_SUCCESS;
+}
+
+grub_efi_status_t
+EFI_FUNC (efiemu_set_time) (grub_efi_time_t *time)
+{
+ LOG ('b');
+ grub_uint8_t state;
+ state = read_cmos (0xb);
+ write_cmos (0xb, state | 0x6);
+ write_cmos (0x9, time->year - 2000);
+ write_cmos (0x8, time->month);
+ write_cmos (0x7, time->day);
+ write_cmos (0x4, time->hour);
+ write_cmos (0x2, time->minute);
+ write_cmos (0x0, time->second);
+ efiemu_time_zone = time->time_zone;
+ efiemu_time_daylight = time->daylight;
+ return GRUB_EFI_SUCCESS;
+}
+
+/* Following 2 functions are vendor specific. So announce it as unsupported */
+grub_efi_status_t
+EFI_FUNC (efiemu_get_wakeup_time) (grub_efi_boolean_t *enabled,
+ grub_efi_boolean_t *pending,
+ grub_efi_time_t *time)
+{
+ LOG ('c');
+ return GRUB_EFI_UNSUPPORTED;
+}
+
+grub_efi_status_t
+EFI_FUNC (efiemu_set_wakeup_time) (grub_efi_boolean_t enabled,
+ grub_efi_time_t *time)
+{
+ LOG ('d');
+ return GRUB_EFI_UNSUPPORTED;
+}
+
+static grub_uint32_t crc32_table [256];
+
+static grub_uint32_t
+reflect (grub_uint32_t ref, int len)
+{
+ grub_uint32_t result = 0;
+ int i;
+
+ for (i = 1; i <= len; i++)
+ {
+ if (ref & 1)
+ result |= 1 << (len - i);
+ ref >>= 1;
+ }
+
+ return result;
+}
+
+static void
+init_crc32_table (void)
+{
+ grub_uint32_t polynomial = 0x04c11db7;
+ int i, j;
+
+ for(i = 0; i < 256; i++)
+ {
+ crc32_table[i] = reflect(i, 8) << 24;
+ for (j = 0; j < 8; j++)
+ crc32_table[i] = (crc32_table[i] << 1) ^
+ (crc32_table[i] & (1 << 31) ? polynomial : 0);
+ crc32_table[i] = reflect(crc32_table[i], 32);
+ }
+}
+
+static grub_uint32_t
+efiemu_getcrc32 (grub_uint32_t crc, void *buf, int size)
+{
+ int i;
+ grub_uint8_t *data = buf;
+
+ if (! crc32_table[1])
+ init_crc32_table ();
+
+ crc^= 0xffffffff;
+
+ for (i = 0; i < size; i++)
+ {
+ crc = (crc >> 8) ^ crc32_table[(crc & 0xFF) ^ *data];
+ data++;
+ }
+
+ return crc ^ 0xffffffff;
+}
+
+
+grub_efi_status_t EFI_FUNC
+(efiemu_set_virtual_address_map) (grub_efi_uintn_t memory_map_size,
+ grub_efi_uintn_t descriptor_size,
+ grub_efi_uint32_t descriptor_version,
+ grub_efi_memory_descriptor_t *virtual_map)
+{
+ struct grub_efiemu_ptv_rel *cur_relloc;
+
+ LOG ('e');
+
+ /* Ensure that we are called only once */
+ if (efiemu_ptv_relocated)
+ return GRUB_EFI_UNSUPPORTED;
+ efiemu_ptv_relocated = 1;
+
+ /* Correct addresses using information supplied by grub */
+ for (cur_relloc = efiemu_ptv_relloc; cur_relloc->size;cur_relloc++)
+ {
+ grub_int64_t corr = 0;
+ grub_efi_memory_descriptor_t *descptr;
+
+ /* Compute correction */
+ for (descptr = virtual_map;
+ ((grub_uint8_t *) descptr - (grub_uint8_t *) virtual_map)
+ < memory_map_size;
+ descptr = (grub_efi_memory_descriptor_t *)
+ ((grub_uint8_t *) descptr + descriptor_size))
+ {
+ if (descptr->type == cur_relloc->plustype)
+ corr += descptr->virtual_start - descptr->physical_start;
+ if (descptr->type == cur_relloc->minustype)
+ corr -= descptr->virtual_start - descptr->physical_start;
+ }
+
+ /* Apply correction */
+ switch (cur_relloc->size)
+ {
+ case 8:
+ *((grub_uint64_t *) UINT_TO_PTR (cur_relloc->addr)) += corr;
+ break;
+ case 4:
+ *((grub_uint32_t *) UINT_TO_PTR (cur_relloc->addr)) += corr;
+ break;
+ case 2:
+ *((grub_uint16_t *) UINT_TO_PTR (cur_relloc->addr)) += corr;
+ break;
+ case 1:
+ *((grub_uint8_t *) UINT_TO_PTR (cur_relloc->addr)) += corr;
+ break;
+ }
+ }
+
+ /* Recompute crc32 of system table and runtime services */
+ efiemu_system_table.hdr.crc32 = 0;
+ efiemu_system_table.hdr.crc32 = efiemu_getcrc32
+ (0, &efiemu_system_table, sizeof (efiemu_system_table));
+
+ efiemu_runtime_services.hdr.crc32 = 0;
+ efiemu_runtime_services.hdr.crc32 = efiemu_getcrc32
+ (0, &efiemu_runtime_services, sizeof (efiemu_runtime_services));
+
+ return GRUB_EFI_SUCCESS;
+}
+
+/* since efiemu_set_virtual_address_map corrects all the pointers
+ we don't need efiemu_convert_pointer */
+grub_efi_status_t
+EFI_FUNC (efiemu_convert_pointer) (grub_efi_uintn_t debug_disposition,
+ void **address)
+{
+ LOG ('f');
+ return GRUB_EFI_UNSUPPORTED;
+}
+
+/* Next comes variable services. Because we have no vendor-independent
+ way to store these variables we have no non-volatility */
+
+/* Find variable by name and GUID. */
+static struct efi_variable *
+find_variable (grub_efi_guid_t *vendor_guid,
+ grub_efi_char16_t *variable_name)
+{
+ grub_uint8_t *ptr;
+ struct efi_variable *efivar;
+
+ for (ptr = efiemu_variables; ptr < efiemu_variables + efiemu_varsize; )
+ {
+ efivar = (struct efi_variable *) ptr;
+ if (!efivar->namelen)
+ return 0;
+ if (efiemu_str16equal((grub_efi_char16_t *)(efivar + 1), variable_name)
+ && efiemu_memequal (&(efivar->guid), vendor_guid,
+ sizeof (efivar->guid)))
+ return efivar;
+ ptr += efivar->namelen + efivar->size + sizeof (*efivar);
+ }
+ return 0;
+}
+
+grub_efi_status_t
+EFI_FUNC (efiemu_get_variable) (grub_efi_char16_t *variable_name,
+ grub_efi_guid_t *vendor_guid,
+ grub_efi_uint32_t *attributes,
+ grub_efi_uintn_t *data_size,
+ void *data)
+{
+ struct efi_variable *efivar;
+ LOG ('g');
+ efivar = find_variable (vendor_guid, variable_name);
+ if (!efivar)
+ return GRUB_EFI_NOT_FOUND;
+ if (*data_size < efivar->size)
+ {
+ *data_size = efivar->size;
+ return GRUB_EFI_BUFFER_TOO_SMALL;
+ }
+ *data_size = efivar->size;
+ efiemu_memcpy (data, (grub_uint8_t *)(efivar + 1) + efivar->namelen,
+ efivar->size);
+ *attributes = efivar->attributes;
+
+ return GRUB_EFI_SUCCESS;
+}
+
+grub_efi_status_t EFI_FUNC
+(efiemu_get_next_variable_name) (grub_efi_uintn_t *variable_name_size,
+ grub_efi_char16_t *variable_name,
+ grub_efi_guid_t *vendor_guid)
+{
+ struct efi_variable *efivar;
+ LOG ('l');
+
+ if (!variable_name_size || !variable_name || !vendor_guid)
+ return GRUB_EFI_INVALID_PARAMETER;
+ if (variable_name[0])
+ {
+ efivar = find_variable (vendor_guid, variable_name);
+ if (!efivar)
+ return GRUB_EFI_NOT_FOUND;
+ efivar = (struct efi_variable *)((grub_uint8_t *)efivar
+ + efivar->namelen
+ + efivar->size + sizeof (*efivar));
+ }
+ else
+ efivar = (struct efi_variable *) (efiemu_variables);
+
+ LOG ('m');
+ if ((grub_uint8_t *)efivar >= efiemu_variables + efiemu_varsize
+ || !efivar->namelen)
+ return GRUB_EFI_NOT_FOUND;
+ if (*variable_name_size < efivar->namelen)
+ {
+ *variable_name_size = efivar->namelen;
+ return GRUB_EFI_BUFFER_TOO_SMALL;
+ }
+
+ efiemu_memcpy (variable_name, efivar + 1, efivar->namelen);
+ efiemu_memcpy (vendor_guid, &(efivar->guid),
+ sizeof (efivar->guid));
+
+ LOG('h');
+ return GRUB_EFI_SUCCESS;
+}
+
+grub_efi_status_t
+EFI_FUNC (efiemu_set_variable) (grub_efi_char16_t *variable_name,
+ grub_efi_guid_t *vendor_guid,
+ grub_efi_uint32_t attributes,
+ grub_efi_uintn_t data_size,
+ void *data)
+{
+ struct efi_variable *efivar;
+ grub_uint8_t *ptr;
+ LOG('i');
+ if (!variable_name[0])
+ return GRUB_EFI_INVALID_PARAMETER;
+ efivar = find_variable (vendor_guid, variable_name);
+
+ /* Delete variable if any */
+ if (efivar)
+ {
+ efiemu_memcpy (efivar, (grub_uint8_t *)(efivar + 1)
+ + efivar->namelen + efivar->size,
+ (efiemu_variables + efiemu_varsize)
+ - ((grub_uint8_t *)(efivar + 1)
+ + efivar->namelen + efivar->size));
+ efiemu_memset (efiemu_variables + efiemu_varsize
+ - (sizeof (*efivar) + efivar->namelen + efivar->size),
+ 0, (sizeof (*efivar) + efivar->namelen + efivar->size));
+ }
+
+ if (!data_size)
+ return GRUB_EFI_SUCCESS;
+
+ for (ptr = efiemu_variables; ptr < efiemu_variables + efiemu_varsize; )
+ {
+ efivar = (struct efi_variable *) ptr;
+ ptr += efivar->namelen + efivar->size + sizeof (*efivar);
+ if (!efivar->namelen)
+ break;
+ }
+ if ((grub_uint8_t *)(efivar + 1) + data_size
+ + 2 * (efiemu_str16len (variable_name) + 1)
+ >= efiemu_variables + efiemu_varsize)
+ return GRUB_EFI_OUT_OF_RESOURCES;
+
+ efiemu_memcpy (&(efivar->guid), vendor_guid, sizeof (efivar->guid));
+ efivar->namelen = 2 * (efiemu_str16len (variable_name) + 1);
+ efivar->size = data_size;
+ efivar->attributes = attributes;
+ efiemu_memcpy (efivar + 1, variable_name,
+ 2 * (efiemu_str16len (variable_name) + 1));
+ efiemu_memcpy ((grub_uint8_t *)(efivar + 1)
+ + 2 * (efiemu_str16len (variable_name) + 1),
+ data, data_size);
+
+ return GRUB_EFI_SUCCESS;
+}
+
+grub_efi_status_t EFI_FUNC
+(efiemu_get_next_high_monotonic_count) (grub_efi_uint32_t *high_count)
+{
+ LOG ('j');
+ if (!high_count)
+ return GRUB_EFI_INVALID_PARAMETER;
+ *high_count = ++efiemu_high_monotonic_count;
+ return GRUB_EFI_SUCCESS;
+}
+
+/* To implement it with APM we need to go to real mode. It's too much hassle
+ Besides EFI specification says that this function shouldn't be used
+ on systems supporting ACPI
+ */
+void
+EFI_FUNC (efiemu_reset_system) (grub_efi_reset_type_t reset_type,
+ grub_efi_status_t reset_status,
+ grub_efi_uintn_t data_size,
+ grub_efi_char16_t *reset_data)
+{
+ LOG ('k');
+}
+
+struct grub_efi_runtime_services efiemu_runtime_services =
+{
+ .hdr =
+ {
+ .signature = GRUB_EFIEMU_RUNTIME_SERVICES_SIGNATURE,
+ .revision = 0x0001000a,
+ .header_size = sizeof (struct grub_efi_runtime_services),
+ .crc32 = 0, /* filled later*/
+ .reserved = 0
+ },
+ .get_time = efiemu_get_time,
+ .set_time = efiemu_set_time,
+ .get_wakeup_time = efiemu_get_wakeup_time,
+ .set_wakeup_time = efiemu_set_wakeup_time,
+
+ .set_virtual_address_map = efiemu_set_virtual_address_map,
+ .convert_pointer = efiemu_convert_pointer,
+
+ .get_variable = efiemu_get_variable,
+ .get_next_variable_name = efiemu_get_next_variable_name,
+ .set_variable = efiemu_set_variable,
+ .get_next_high_monotonic_count = efiemu_get_next_high_monotonic_count,
+
+ .reset_system = efiemu_reset_system
+};
+
+
+static grub_uint16_t efiemu_vendor[] =
+ {'G', 'R', 'U', 'B', ' ', 'E', 'F', 'I', ' ',
+ 'R', 'U', 'N', 'T', 'I', 'M', 'E', 0};
+
+struct grub_efi_system_table efiemu_system_table =
+{
+ .hdr =
+ {
+ .signature = GRUB_EFIEMU_SYSTEM_TABLE_SIGNATURE,
+ .revision = 0x0001000a,
+ .header_size = sizeof (struct grub_efi_system_table),
+ .crc32 = 0, /* filled later*/
+ .reserved = 0
+ },
+ .firmware_vendor = efiemu_vendor,
+ .firmware_revision = 0x0001000a,
+ .console_in_handler = 0,
+ .con_in = 0,
+ .console_out_handler = 0,
+ .con_out = 0,
+ .standard_error_handle = 0,
+ .std_err = 0,
+ .runtime_services = &efiemu_runtime_services,
+ .boot_services = 0,
+ .num_table_entries = 0,
+ .configuration_table = 0
+};
+