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// SPDX-License-Identifier: GPL-2.0
// Copyright (c) 2019 Ahmad Fatoum, Pengutronix
#define pr_fmt(fmt) "efi-iomem: " fmt
#include <common.h>
#include <init.h>
#include <efi.h>
#include <efi/efi.h>
#include <memory.h>
#include <linux/sizes.h>
static int efi_parse_mmap(struct efi_memory_desc *desc)
{
struct resource *res;
u32 flags;
const char *name;
char *fullname;
resource_size_t va_base, va_size;
int ret = 0;
va_size = desc->npages * SZ_4K;
if (!va_size)
return 0;
/* XXX At least OVMF doesn't populate ->virt_start and leaves it at zero
* for all mapping. Thus assume a 1:1 mapping and ignore virt_start
*/
va_base = desc->phys_start;
switch (desc->type) {
case EFI_RESERVED_TYPE:
if (!IS_ENABLED(DEBUG))
return 0;
name = "reserved";
flags = IORESOURCE_MEM | IORESOURCE_DISABLED;
break;
case EFI_LOADER_CODE:
name = "loader code";
flags = IORESOURCE_MEM | IORESOURCE_READONLY;
break;
case EFI_LOADER_DATA:
name = "loader data";
flags = IORESOURCE_MEM;
break;
case EFI_BOOT_SERVICES_CODE:
if (!IS_ENABLED(DEBUG))
return 0;
name = "boot services code";
flags = IORESOURCE_MEM | IORESOURCE_READONLY;
break;
case EFI_BOOT_SERVICES_DATA:
if (!IS_ENABLED(DEBUG))
return 0;
name = "boot services data";
flags = IORESOURCE_MEM;
break;
case EFI_RUNTIME_SERVICES_CODE:
if (!IS_ENABLED(DEBUG))
return 0;
name = "runtime services code";
flags = IORESOURCE_MEM | IORESOURCE_READONLY;
break;
case EFI_RUNTIME_SERVICES_DATA:
if (!IS_ENABLED(DEBUG))
return 0;
name = "runtime services data";
flags = IORESOURCE_MEM;
break;
case EFI_CONVENTIONAL_MEMORY:
if (!IS_ENABLED(DEBUG))
return 0;
name = "conventional memory";
flags = IORESOURCE_MEM | IORESOURCE_PREFETCH | IORESOURCE_CACHEABLE;
break;
case EFI_UNUSABLE_MEMORY:
if (!IS_ENABLED(DEBUG))
return 0;
name = "unusable";
flags = IORESOURCE_MEM | IORESOURCE_DISABLED;
break;
case EFI_ACPI_RECLAIM_MEMORY:
if (!IS_ENABLED(DEBUG))
return 0;
name = "ACPI reclaim memory";
flags = IORESOURCE_MEM | IORESOURCE_READONLY;
break;
case EFI_ACPI_MEMORY_NVS:
if (!IS_ENABLED(DEBUG))
return 0;
name = "ACPI NVS memory";
flags = IORESOURCE_MEM | IORESOURCE_READONLY;
break;
case EFI_MEMORY_MAPPED_IO:
if (!IS_ENABLED(DEBUG))
return 0;
name = "MMIO";
flags = IORESOURCE_MEM;
break;
case EFI_MEMORY_MAPPED_IO_PORT_SPACE:
if (!IS_ENABLED(DEBUG))
return 0;
name = "MMIOPORT";
flags = IORESOURCE_IO;
break;
case EFI_PAL_CODE:
if (!IS_ENABLED(DEBUG))
return 0;
name = "PAL code";
flags = IORESOURCE_MEM | IORESOURCE_ROM_BIOS_COPY;
break;
default:
if (!(desc->type & (1U << 31))) {
pr_warn("illegal memory type = %u >= %u\n",
desc->type, EFI_MAX_MEMORY_TYPE);
return -EINVAL;
}
if (!IS_ENABLED(DEBUG))
return 0;
name = "vendor reserved";
flags = IORESOURCE_MEM | IORESOURCE_ROM_BIOS_COPY;
}
fullname = xasprintf("%s@%llx", name, desc->phys_start);
pr_debug("%s: (0x%llx+0x%llx)\n", fullname, va_base, va_size);
res = request_iomem_region(fullname, va_base, va_base + va_size - 1);
if (IS_ERR(res)) {
ret = PTR_ERR(res);
goto out;
}
res->flags |= flags;
out:
free(fullname);
return ret;
}
static int efi_barebox_populate_mmap(void)
{
void *desc;
u8 *mmap_buf = NULL;
efi_status_t efiret;
size_t mmap_size;
size_t mapkey;
size_t descsz;
u32 descver;
int ret = 0;
mmap_size = sizeof(struct efi_memory_desc);
do {
mmap_buf = xrealloc(mmap_buf, mmap_size);
efiret = BS->get_memory_map(&mmap_size, mmap_buf,
&mapkey, &descsz, &descver);
} while (efiret == EFI_BUFFER_TOO_SMALL);
if (EFI_ERROR(efiret)) {
ret = -efi_errno(efiret);
goto out;
}
if (descver != 1) {
ret = -ENOSYS;
goto out;
}
for (desc = mmap_buf; (u8 *)desc < &mmap_buf[mmap_size]; desc += descsz)
efi_parse_mmap(desc);
out:
free(mmap_buf);
return ret;
}
mem_initcall(efi_barebox_populate_mmap);
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