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Message-Id: <20200430182843.2510180-3-nivedita@alum.mit.edu>
Date: Thu, 30 Apr 2020 14:28:34 -0400
From: Arvind Sankar <nivedita@...m.mit.edu>
To: Ard Biesheuvel <ardb@...nel.org>
Cc: linux-efi@...r.kernel.org, x86@...nel.org,
linux-kernel@...r.kernel.org
Subject: [PATCH v2 02/11] efi/libstub: Add a helper function to split 64-bit values
In several places 64-bit values need to be split up into two 32-bit
fields, in order to be backward-compatible with the old 32-bit ABIs.
Instead of open-coding this, add a helper function to set a 64-bit value
as two 32-bit fields.
Signed-off-by: Arvind Sankar <nivedita@...m.mit.edu>
---
drivers/firmware/efi/libstub/efistub.h | 7 ++++++
drivers/firmware/efi/libstub/gop.c | 6 ++---
drivers/firmware/efi/libstub/x86-stub.c | 32 +++++++++++--------------
3 files changed, 23 insertions(+), 22 deletions(-)
diff --git a/drivers/firmware/efi/libstub/efistub.h b/drivers/firmware/efi/libstub/efistub.h
index 5ff63230a1f1..e8aa70ba08d5 100644
--- a/drivers/firmware/efi/libstub/efistub.h
+++ b/drivers/firmware/efi/libstub/efistub.h
@@ -87,6 +87,13 @@ extern const efi_system_table_t *efi_system_table;
((handle = efi_get_handle_at((array), i)) || true); \
i++)
+static inline
+void efi_set_u64_split(u64 data, u32 *lo, u32 *hi)
+{
+ *lo = lower_32_bits(data);
+ *hi = upper_32_bits(data);
+}
+
/*
* Allocation types for calls to boottime->allocate_pages.
*/
diff --git a/drivers/firmware/efi/libstub/gop.c b/drivers/firmware/efi/libstub/gop.c
index 216327d0b034..64cee0febae0 100644
--- a/drivers/firmware/efi/libstub/gop.c
+++ b/drivers/firmware/efi/libstub/gop.c
@@ -422,7 +422,6 @@ static efi_status_t setup_gop(struct screen_info *si, efi_guid_t *proto,
efi_graphics_output_protocol_t *gop;
efi_graphics_output_protocol_mode_t *mode;
efi_graphics_output_mode_info_t *info;
- efi_physical_addr_t fb_base;
gop = find_gop(proto, size, handles);
@@ -442,9 +441,8 @@ static efi_status_t setup_gop(struct screen_info *si, efi_guid_t *proto,
si->lfb_width = info->horizontal_resolution;
si->lfb_height = info->vertical_resolution;
- fb_base = efi_table_attr(mode, frame_buffer_base);
- si->lfb_base = lower_32_bits(fb_base);
- si->ext_lfb_base = upper_32_bits(fb_base);
+ efi_set_u64_split(efi_table_attr(mode, frame_buffer_base),
+ &si->lfb_base, &si->ext_lfb_base);
if (si->ext_lfb_base)
si->capabilities |= VIDEO_CAPABILITY_64BIT_BASE;
diff --git a/drivers/firmware/efi/libstub/x86-stub.c b/drivers/firmware/efi/libstub/x86-stub.c
index d4bafd7f6f9f..f91d4aab0156 100644
--- a/drivers/firmware/efi/libstub/x86-stub.c
+++ b/drivers/firmware/efi/libstub/x86-stub.c
@@ -408,9 +408,8 @@ efi_status_t __efiapi efi_pe_entry(efi_handle_t handle,
if (!cmdline_ptr)
goto fail;
- hdr->cmd_line_ptr = (unsigned long)cmdline_ptr;
- /* Fill in upper bits of command line address, NOP on 32 bit */
- boot_params->ext_cmd_line_ptr = (u64)(unsigned long)cmdline_ptr >> 32;
+ efi_set_u64_split((unsigned long)cmdline_ptr,
+ &hdr->cmd_line_ptr, &boot_params->ext_cmd_line_ptr);
hdr->ramdisk_image = 0;
hdr->ramdisk_size = 0;
@@ -427,10 +426,10 @@ efi_status_t __efiapi efi_pe_entry(efi_handle_t handle,
ULONG_MAX);
if (status != EFI_SUCCESS)
goto fail2;
- hdr->ramdisk_image = ramdisk_addr & 0xffffffff;
- hdr->ramdisk_size = ramdisk_size & 0xffffffff;
- boot_params->ext_ramdisk_image = (u64)ramdisk_addr >> 32;
- boot_params->ext_ramdisk_size = (u64)ramdisk_size >> 32;
+ efi_set_u64_split(ramdisk_addr, &hdr->ramdisk_image,
+ &boot_params->ext_ramdisk_image);
+ efi_set_u64_split(ramdisk_size, &hdr->ramdisk_size,
+ &boot_params->ext_ramdisk_size);
}
}
@@ -639,17 +638,14 @@ static efi_status_t exit_boot_func(struct efi_boot_memmap *map,
: EFI32_LOADER_SIGNATURE;
memcpy(&p->efi->efi_loader_signature, signature, sizeof(__u32));
- p->efi->efi_systab = (unsigned long)efi_system_table;
+ efi_set_u64_split((unsigned long)efi_system_table,
+ &p->efi->efi_systab, &p->efi->efi_systab_hi);
p->efi->efi_memdesc_size = *map->desc_size;
p->efi->efi_memdesc_version = *map->desc_ver;
- p->efi->efi_memmap = (unsigned long)*map->map;
+ efi_set_u64_split((unsigned long)*map->map,
+ &p->efi->efi_memmap, &p->efi->efi_memmap_hi);
p->efi->efi_memmap_size = *map->map_size;
-#ifdef CONFIG_X86_64
- p->efi->efi_systab_hi = (unsigned long)efi_system_table >> 32;
- p->efi->efi_memmap_hi = (unsigned long)*map->map >> 32;
-#endif
-
return EFI_SUCCESS;
}
@@ -785,10 +781,10 @@ unsigned long efi_main(efi_handle_t handle,
status = efi_load_initrd_dev_path(&addr, &size, ULONG_MAX);
if (status == EFI_SUCCESS) {
- hdr->ramdisk_image = (u32)addr;
- hdr->ramdisk_size = (u32)size;
- boot_params->ext_ramdisk_image = (u64)addr >> 32;
- boot_params->ext_ramdisk_size = (u64)size >> 32;
+ efi_set_u64_split(addr, &hdr->ramdisk_image,
+ &boot_params->ext_ramdisk_image);
+ efi_set_u64_split(size, &hdr->ramdisk_size,
+ &boot_params->ext_ramdisk_size);
} else if (status != EFI_NOT_FOUND) {
efi_printk("efi_load_initrd_dev_path() failed!\n");
goto fail;
--
2.26.2
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