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efi: Fix truncation of constant value

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Starting with commit 867a6ac86d ("efi: Add start-up library code"),
sparse constantly complains about truncated constant value in efi.h:

include/efi.h:176:35: warning: cast truncates bits from constant value (8000000000000000 becomes 0)

This can get quite noisy, preventing real issues to be noticed:

$ make defconfig
*** Default configuration is based on 'sandbox_defconfig'
$ make C=2 -j12 2>&1 | grep truncates | wc -l
441

After the patch is applied:
$ make C=2 -j12 2>&1 | grep truncates | wc -l
0
$ sparse --version
v0.5.2

Following the suggestion of Heinrich Schuchardt, instead of only
fixing the root-cause, I replaced the whole enum of _SHIFT values
by ULL defines. This matches both the UEFI 2.7 spec and the Linux
kernel implementation.

Some ELF size comparison before and after the patch (gcc 7.3.0):

efi-x86_payload64_defconfig:
text    data    bss     dec       hex   filename
407174  29432   278676  715282    aea12 u-boot.old
407152  29464   278676  715292    aea1c u-boot.new
-22     +32     0       +10

efi-x86_payload32_defconfig:
text    data    bss     dec       hex   filename
447075  30308   280076  757459    b8ed3 u-boot.old
447053  30340   280076  757469    b8edd u-boot.new
-22     +32     0       +10

Fixes: 867a6ac86d ("efi: Add start-up library code")
Suggested-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Signed-off-by: Eugeniu Rosca <erosca@de.adit-jv.com>
Reviewed-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Reviewed-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Eugeniu Rosca 2018-07-14 22:53:30 +02:00 committed by Alexander Graf
parent 9d12daff6c
commit 9b89183b97
3 changed files with 24 additions and 29 deletions
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22
cmd/efi.c
View file

@ -28,18 +28,18 @@ static const char *const type_name[] = {
};
static struct attr_info {
int shift;
u64 val;
const char *name;
} mem_attr[] = {
{ EFI_MEMORY_UC_SHIFT, "uncached" },
{ EFI_MEMORY_WC_SHIFT, "write-coalescing" },
{ EFI_MEMORY_WT_SHIFT, "write-through" },
{ EFI_MEMORY_WB_SHIFT, "write-back" },
{ EFI_MEMORY_UCE_SHIFT, "uncached & exported" },
{ EFI_MEMORY_WP_SHIFT, "write-protect" },
{ EFI_MEMORY_RP_SHIFT, "read-protect" },
{ EFI_MEMORY_XP_SHIFT, "execute-protect" },
{ EFI_MEMORY_RUNTIME_SHIFT, "needs runtime mapping" }
{ EFI_MEMORY_UC, "uncached" },
{ EFI_MEMORY_WC, "write-coalescing" },
{ EFI_MEMORY_WT, "write-through" },
{ EFI_MEMORY_WB, "write-back" },
{ EFI_MEMORY_UCE, "uncached & exported" },
{ EFI_MEMORY_WP, "write-protect" },
{ EFI_MEMORY_RP, "read-protect" },
{ EFI_MEMORY_XP, "execute-protect" },
{ EFI_MEMORY_RUNTIME, "needs runtime mapping" }
};
/* Maximum different attribute values we can track */
@ -173,7 +173,7 @@ static void efi_print_mem_table(struct efi_entry_memmap *map,
printf("%c%llx: ", attr & EFI_MEMORY_RUNTIME ? 'r' : ' ',
attr & ~EFI_MEMORY_RUNTIME);
for (j = 0, first = true; j < ARRAY_SIZE(mem_attr); j++) {
if (attr & (1ULL << mem_attr[j].shift)) {
if (attr & mem_attr[j].val) {
if (first)
first = false;
else

24
include/efi.h
View file

@ -170,20 +170,16 @@ enum efi_mem_type {
};
/* Attribute values */
enum {
EFI_MEMORY_UC_SHIFT = 0, /* uncached */
EFI_MEMORY_WC_SHIFT = 1, /* write-coalescing */
EFI_MEMORY_WT_SHIFT = 2, /* write-through */
EFI_MEMORY_WB_SHIFT = 3, /* write-back */
EFI_MEMORY_UCE_SHIFT = 4, /* uncached, exported */
EFI_MEMORY_WP_SHIFT = 12, /* write-protect */
EFI_MEMORY_RP_SHIFT = 13, /* read-protect */
EFI_MEMORY_XP_SHIFT = 14, /* execute-protect */
EFI_MEMORY_RUNTIME_SHIFT = 63, /* range requires runtime mapping */
EFI_MEMORY_RUNTIME = 1ULL << EFI_MEMORY_RUNTIME_SHIFT,
EFI_MEM_DESC_VERSION = 1,
};
#define EFI_MEMORY_UC ((u64)0x0000000000000001ULL) /* uncached */
#define EFI_MEMORY_WC ((u64)0x0000000000000002ULL) /* write-coalescing */
#define EFI_MEMORY_WT ((u64)0x0000000000000004ULL) /* write-through */
#define EFI_MEMORY_WB ((u64)0x0000000000000008ULL) /* write-back */
#define EFI_MEMORY_UCE ((u64)0x0000000000000010ULL) /* uncached, exported */
#define EFI_MEMORY_WP ((u64)0x0000000000001000ULL) /* write-protect */
#define EFI_MEMORY_RP ((u64)0x0000000000002000ULL) /* read-protect */
#define EFI_MEMORY_XP ((u64)0x0000000000004000ULL) /* execute-protect */
#define EFI_MEMORY_RUNTIME ((u64)0x8000000000000000ULL) /* range requires runtime mapping */
#define EFI_MEM_DESC_VERSION 1
#define EFI_PAGE_SHIFT 12
#define EFI_PAGE_SIZE (1UL << EFI_PAGE_SHIFT)

7
lib/efi_loader/efi_memory.c
View file

@ -178,14 +178,13 @@ uint64_t efi_add_memory_map(uint64_t start, uint64_t pages, int memory_type,
switch (memory_type) {
case EFI_RUNTIME_SERVICES_CODE:
case EFI_RUNTIME_SERVICES_DATA:
newlist->desc.attribute = (1 << EFI_MEMORY_WB_SHIFT) |
(1ULL << EFI_MEMORY_RUNTIME_SHIFT);
newlist->desc.attribute = EFI_MEMORY_WB | EFI_MEMORY_RUNTIME;
break;
case EFI_MMAP_IO:
newlist->desc.attribute = 1ULL << EFI_MEMORY_RUNTIME_SHIFT;
newlist->desc.attribute = EFI_MEMORY_RUNTIME;
break;
default:
newlist->desc.attribute = 1 << EFI_MEMORY_WB_SHIFT;
newlist->desc.attribute = EFI_MEMORY_WB;
break;
}