Commit 2bb9839e authored by Nicolas Pitre's avatar Nicolas Pitre Committed by Nicolas Pitre

ARM: introduce atag_offset to replace boot_params

The boot_params member of the mdesc structure is used to provide a
default physical address for the ATAG list.  Since this value is fixed
at compile time and sometimes based on constants such as ARCH_PHYS_OFFSET,
it gets in the way of runtime PHYS_OFFSET and CONFIG_ARM_PATCH_PHYS_VIRT
usage.

Let's introduce atag_offset which should contains only the relative
offset from PHYS_OFFSET instead of an absolute value, in preparation
to move all instance of boot_params over to it.
Signed-off-by: default avatarNicolas Pitre <nicolas.pitre@linaro.org>
Tested-by: default avatarH Hartley Sweeten <hsweeten@visionengravers.com>
Tested-by: default avatarPetr Štetiar <ynezz@true.cz>
Acked-by: default avatarArnd Bergmann <arnd@arndb.de>
parent 93ee7a93
...@@ -18,6 +18,7 @@ struct machine_desc { ...@@ -18,6 +18,7 @@ struct machine_desc {
unsigned int nr; /* architecture number */ unsigned int nr; /* architecture number */
const char *name; /* architecture name */ const char *name; /* architecture name */
unsigned long boot_params; /* tagged list */ unsigned long boot_params; /* tagged list */
unsigned long atag_offset; /* tagged list (relative) */
const char **dt_compat; /* array of device tree const char **dt_compat; /* array of device tree
* 'compatible' strings */ * 'compatible' strings */
......
...@@ -819,6 +819,8 @@ static struct machine_desc * __init setup_machine_tags(unsigned int nr) ...@@ -819,6 +819,8 @@ static struct machine_desc * __init setup_machine_tags(unsigned int nr)
if (__atags_pointer) if (__atags_pointer)
tags = phys_to_virt(__atags_pointer); tags = phys_to_virt(__atags_pointer);
else if (mdesc->atag_offset)
tags = (void *)(PAGE_OFFSET + mdesc->atag_offset);
else if (mdesc->boot_params) { else if (mdesc->boot_params) {
#ifdef CONFIG_MMU #ifdef CONFIG_MMU
/* /*
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment