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grub2
0007-x86-efi-Make-our-own-allocator-for-kernel-...
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File 0007-x86-efi-Make-our-own-allocator-for-kernel-stuff.patch of Package grub2
From 2a84f1a50c6f8770808fd4ec590eb8cff4228aed Mon Sep 17 00:00:00 2001 From: Peter Jones <pjones@redhat.com> Date: Wed, 12 Sep 2018 16:03:55 -0400 Subject: [PATCH 07/11] x86-efi: Make our own allocator for kernel stuff This helps enable allocations above 4GB. Signed-off-by: Peter Jones <pjones@redhat.com> --- grub-core/loader/i386/efi/linux.c | 155 ++++++++++++++++++------------ 1 file changed, 94 insertions(+), 61 deletions(-) diff --git a/grub-core/loader/i386/efi/linux.c b/grub-core/loader/i386/efi/linux.c index 096a52eb5..d284db5d1 100644 --- a/grub-core/loader/i386/efi/linux.c +++ b/grub-core/loader/i386/efi/linux.c @@ -47,6 +47,65 @@ static char *linux_cmdline; #define BYTES_TO_PAGES(bytes) (((bytes) + 0xfff) >> 12) +struct allocation_choice { + grub_efi_physical_address_t addr; + grub_efi_allocate_type_t alloc_type; +}; + +static struct allocation_choice max_addresses[] = + { + { GRUB_EFI_MAX_ALLOCATION_ADDRESS, GRUB_EFI_ALLOCATE_MAX_ADDRESS }, + { GRUB_EFI_MAX_ALLOCATION_ADDRESS, GRUB_EFI_ALLOCATE_MAX_ADDRESS }, + { GRUB_EFI_MAX_ALLOCATION_ADDRESS, GRUB_EFI_ALLOCATE_MAX_ADDRESS }, + { 0, 0 } + }; + +static inline void +kernel_free(void *addr, grub_efi_uintn_t size) +{ + if (addr && size) + grub_efi_free_pages ((grub_efi_physical_address_t)(grub_addr_t)addr, + BYTES_TO_PAGES(size)); +} + +static void * +kernel_alloc(grub_efi_uintn_t size, const char * const errmsg) +{ + void *addr = 0; + unsigned int i; + grub_efi_physical_address_t prev_max = 0; + + for (i = 0; max_addresses[i].addr != 0 && addr == 0; i++) + { + grub_uint64_t max = max_addresses[i].addr; + grub_efi_uintn_t pages; + + if (max == prev_max) + continue; + + pages = BYTES_TO_PAGES(size); + grub_dprintf ("linux", "Trying to allocate %" PRIuGRUB_SIZE" pages from %p\n", + pages, (void *)(grub_addr_t)max); + + prev_max = max; + addr = grub_efi_allocate_pages_real (max, pages, + max_addresses[i].alloc_type, + GRUB_EFI_LOADER_DATA); + if (addr) + grub_dprintf ("linux", "Allocated at %p\n", addr); + } + + while (grub_error_pop ()) + { + ; + } + + if (addr == NULL) + grub_error (GRUB_ERR_OUT_OF_MEMORY, "%s", errmsg); + + return addr; +} + static grub_err_t grub_linuxefi_boot (void) { @@ -62,14 +121,12 @@ grub_linuxefi_unload (void) { grub_dl_unref (my_mod); loaded = 0; - if (initrd_mem) - grub_efi_free_pages((grub_efi_physical_address_t)(grub_addr_t)initrd_mem, BYTES_TO_PAGES(params->ramdisk_size)); - if (linux_cmdline) - grub_efi_free_pages((grub_efi_physical_address_t)(grub_addr_t)linux_cmdline, BYTES_TO_PAGES(params->cmdline_size + 1)); - if (kernel_mem) - grub_efi_free_pages((grub_efi_physical_address_t)(grub_addr_t)kernel_mem, BYTES_TO_PAGES(kernel_size)); - if (params) - grub_efi_free_pages((grub_efi_physical_address_t)(grub_addr_t)params, BYTES_TO_PAGES(16384)); + + kernel_free(initrd_mem, params->ramdisk_size); + kernel_free(linux_cmdline, params->cmdline_size + 1); + kernel_free(kernel_mem, kernel_size); + kernel_free(params, sizeof(*params)); + return GRUB_ERR_NONE; } @@ -146,17 +203,13 @@ grub_cmd_initrd (grub_command_t cmd __attribute__ ((unused)), size += ALIGN_UP (grub_file_size (files[i]), 4); } - initrd_mem = grub_efi_allocate_pages_max (GRUB_EFI_MAX_ALLOCATION_ADDRESS, BYTES_TO_PAGES(size)); - if (!initrd_mem) - initrd_mem = grub_efi_allocate_pages_max (GRUB_EFI_MAX_USABLE_ADDRESS, BYTES_TO_PAGES(size)); - if (!initrd_mem) - { - grub_error (GRUB_ERR_OUT_OF_MEMORY, N_("can't allocate initrd")); - goto fail; - } + initrd_mem = kernel_alloc(size, N_("can't allocate initrd")); + if (initrd_mem == NULL) + goto fail; + grub_dprintf ("linux", "initrd_mem = %p\n", initrd_mem); params->ramdisk_size = size; - params->ramdisk_image = (grub_uint32_t)(grub_addr_t) initrd_mem; + params->ramdisk_image = initrd_mem; ptr = initrd_mem; @@ -214,7 +267,6 @@ grub_cmd_linux (grub_command_t cmd __attribute__ ((unused)), filelen = grub_file_size (file); kernel = grub_malloc(filelen); - if (!kernel) { grub_error (GRUB_ERR_OUT_OF_MEMORY, N_("cannot allocate kernel buffer")); @@ -258,7 +310,7 @@ grub_cmd_linux (grub_command_t cmd __attribute__ ((unused)), goto fail; } -#if defined(__x86_64__) || defined(__aarch64__) +#if defined(__x86_64__) grub_dprintf ("linux", "checking lh->xloadflags\n"); if (!(lh->xloadflags & LINUX_XLF_KERNEL_64)) { @@ -277,17 +329,9 @@ grub_cmd_linux (grub_command_t cmd __attribute__ ((unused)), } #endif - params = grub_efi_allocate_pages_max (GRUB_EFI_MAX_ALLOCATION_ADDRESS, - BYTES_TO_PAGES(sizeof(*params))); + params = kernel_alloc (sizeof(*params), "cannot allocate kernel parameters"); if (!params) - params = grub_efi_allocate_pages_max (GRUB_EFI_MAX_USABLE_ADDRESS, - BYTES_TO_PAGES(sizeof(*params))); - if (! params) - { - grub_error (GRUB_ERR_OUT_OF_MEMORY, "cannot allocate kernel parameters"); - goto fail; - } - + goto fail; grub_dprintf ("linux", "params = %p\n", params); grub_memset (params, 0, sizeof(*params)); @@ -306,16 +350,10 @@ grub_cmd_linux (grub_command_t cmd __attribute__ ((unused)), grub_dprintf ("linux", "new lh is at %p\n", lh); grub_dprintf ("linux", "setting up cmdline\n"); - linux_cmdline = grub_efi_allocate_pages_max(GRUB_EFI_MAX_ALLOCATION_ADDRESS, - BYTES_TO_PAGES(lh->cmdline_size + 1)); + linux_cmdline = kernel_alloc (lh->cmdline_size + 1, N_("can't allocate cmdline")); if (!linux_cmdline) - linux_cmdline = grub_efi_allocate_pages_max(GRUB_EFI_MAX_USABLE_ADDRESS, - BYTES_TO_PAGES(lh->cmdline_size + 1)); - if (!linux_cmdline) - { - grub_error (GRUB_ERR_OUT_OF_MEMORY, N_("can't allocate cmdline")); - goto fail; - } + goto fail; + grub_dprintf ("linux", "linux_cmdline = %p\n", linux_cmdline); grub_memcpy (linux_cmdline, LINUX_IMAGE, sizeof (LINUX_IMAGE)); err = grub_create_loader_cmdline (argc, argv, @@ -326,27 +364,24 @@ grub_cmd_linux (grub_command_t cmd __attribute__ ((unused)), goto fail; grub_dprintf ("linux", "cmdline:%s\n", linux_cmdline); - grub_dprintf ("linux", "setting lh->cmd_line_ptr\n"); - lh->cmd_line_ptr = (grub_uint32_t)(grub_addr_t)linux_cmdline; + grub_dprintf ("linux", "setting lh->cmd_line_ptr to 0x%08x\n", + linux_cmdline); + lh->cmd_line_ptr = linux_cmdline; handover_offset = lh->handover_offset; - grub_dprintf("linux", "handover_offset: %08x\n", handover_offset); + grub_dprintf("linux", "handover_offset: 0x%08x\n", handover_offset); start = (lh->setup_sects + 1) * 512; - kernel_mem = grub_efi_allocate_pages_max(lh->pref_address, - BYTES_TO_PAGES(lh->init_size)); - if (!kernel_mem) - kernel_mem = grub_efi_allocate_pages_max(GRUB_EFI_MAX_ALLOCATION_ADDRESS, - BYTES_TO_PAGES(lh->init_size)); - if (!kernel_mem) - kernel_mem = grub_efi_allocate_pages_max(GRUB_EFI_MAX_USABLE_ADDRESS, - BYTES_TO_PAGES(lh->init_size)); - if (!kernel_mem) + grub_dprintf ("linux", "lh->pref_address: %p\n", (void *)(grub_addr_t)lh->pref_address); + if (lh->pref_address < (grub_uint64_t)GRUB_EFI_MAX_ALLOCATION_ADDRESS) { - grub_error (GRUB_ERR_OUT_OF_MEMORY, N_("can't allocate kernel")); - goto fail; + max_addresses[0].addr = lh->pref_address; + max_addresses[0].alloc_type = GRUB_EFI_ALLOCATE_ADDRESS; } + kernel_mem = kernel_alloc (lh->init_size, N_("can't allocate kernel")); + if (!kernel_mem) + goto fail; grub_dprintf("linux", "kernel_mem = %p\n", kernel_mem); grub_loader_set (grub_linuxefi_boot, grub_linuxefi_unload, 0); @@ -382,16 +417,14 @@ grub_cmd_linux (grub_command_t cmd __attribute__ ((unused)), loaded = 0; } - if (linux_cmdline && lh && !loaded) - grub_efi_free_pages ((grub_efi_physical_address_t)(grub_addr_t) - linux_cmdline, - BYTES_TO_PAGES(lh->cmdline_size + 1)); - - if (kernel_mem && !loaded) - grub_efi_free_pages((grub_efi_physical_address_t)(grub_addr_t)kernel_mem, BYTES_TO_PAGES(kernel_size)); + if (!loaded) + { + if (lh) + kernel_free (linux_cmdline, lh->cmdline_size + 1); - if (params && !loaded) - grub_efi_free_pages((grub_efi_physical_address_t)(grub_addr_t)params, BYTES_TO_PAGES(16384)); + kernel_free (kernel_mem, kernel_size); + kernel_free (params, sizeof(*params)); + } return grub_errno; } -- 2.31.1
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