u-boot/arch/arm/include/asm/secure.h
Marc Zyngier f510aeae68 ARM: HYP/non-sec: allow relocation to secure RAM
The current non-sec switching code suffers from one major issue:
it cannot run in secure RAM, as a large part of u-boot still needs
to be run while we're switched to non-secure.

This patch reworks the whole HYP/non-secure strategy by:
- making sure the secure code is the *last* thing u-boot executes
  before entering the payload
- performing an exception return from secure mode directly into
  the payload
- allowing the code to be dynamically relocated to secure RAM
  before switching to non-secure.

This involves quite a bit of horrible code, specially as u-boot
relocation is quite primitive.

Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Acked-by: Ian Campbell <ijc@hellion.org.uk>
2014-07-28 17:19:09 +02:00

26 lines
640 B
C

#ifndef __ASM_SECURE_H
#define __ASM_SECURE_H
#include <config.h>
#ifdef CONFIG_ARMV7_SECURE_BASE
/*
* Warning, horror ahead.
*
* The target code lives in our "secure ram", but u-boot doesn't know
* that, and has blindly added reloc_off to every relocation
* entry. Gahh. Do the opposite conversion. This hack also prevents
* GCC from generating code veeners, which u-boot doesn't relocate at
* all...
*/
#define secure_ram_addr(_fn) ({ \
DECLARE_GLOBAL_DATA_PTR; \
void *__fn = _fn; \
typeof(_fn) *__tmp = (__fn - gd->reloc_off); \
__tmp; \
})
#else
#define secure_ram_addr(_fn) (_fn)
#endif
#endif