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Jan Beulich
04d4312440
While casting to pointer types may be more natural there, the subtraction then ends up violating "Subtraction between pointers shall only be applied to pointers that address elements of the same array". Use unsigned long arithmetic instead. No functional change intended. Signed-off-by: Jan Beulich <jbeulich@suse.com> Acked-by: Marek Marczykowski-Górecki <marmarek@invisiblethingslab.com>
67 lines
2.0 KiB
C
67 lines
2.0 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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#include <xen/efi.h>
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#include <xen/init.h>
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#include <xen/multiboot2.h>
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#include <asm/asm_defns.h>
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#include <asm/efi.h>
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const char * asmlinkage __init
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efi_multiboot2_prelude(uint32_t magic, const multiboot2_fixed_t *mbi)
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{
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const multiboot2_tag_t *tag;
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EFI_HANDLE ImageHandle = NULL;
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EFI_SYSTEM_TABLE *SystemTable = NULL;
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const char *cmdline = NULL;
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unsigned long mbi_raw = (unsigned long)mbi;
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bool have_bs = false;
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if ( magic != MULTIBOOT2_BOOTLOADER_MAGIC )
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return "ERR: Not a Multiboot2 bootloader!";
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/* Skip Multiboot2 information fixed part. */
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tag = _p(ROUNDUP((unsigned long)(mbi + 1), MULTIBOOT2_TAG_ALIGN));
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for ( ; (unsigned long)(tag + 1) - mbi_raw <= mbi->total_size &&
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tag->type != MULTIBOOT2_TAG_TYPE_END &&
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tag->size >= sizeof(*tag) &&
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(unsigned long)tag + tag->size - mbi_raw <= mbi->total_size;
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tag = _p(ROUNDUP((unsigned long)tag + tag->size,
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MULTIBOOT2_TAG_ALIGN)) )
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{
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switch ( tag->type )
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{
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case MULTIBOOT2_TAG_TYPE_EFI_BS:
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have_bs = true;
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break;
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case MULTIBOOT2_TAG_TYPE_EFI64:
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SystemTable = _p(((const multiboot2_tag_efi64_t *)tag)->pointer);
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break;
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case MULTIBOOT2_TAG_TYPE_EFI64_IH:
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ImageHandle = _p(((const multiboot2_tag_efi64_ih_t *)tag)->pointer);
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break;
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case MULTIBOOT2_TAG_TYPE_CMDLINE:
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cmdline = ((const multiboot2_tag_string_t *)tag)->string;
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break;
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default:
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/* Satisfy MISRA requirement. */
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break;
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}
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}
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if ( !have_bs )
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return "ERR: Bootloader shutdown EFI x64 boot services!";
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if ( !SystemTable )
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return "ERR: EFI SystemTable is not provided by bootloader!";
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if ( !ImageHandle )
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return "ERR: EFI ImageHandle is not provided by bootloader!";
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efi_multiboot2(ImageHandle, SystemTable, cmdline);
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return NULL;
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}
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