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https://github.com/smaeul/u-boot.git
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f510aeae68
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>
27 lines
640 B
C
27 lines
640 B
C
#ifndef __ASM_SECURE_H
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#define __ASM_SECURE_H
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#include <config.h>
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#ifdef CONFIG_ARMV7_SECURE_BASE
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/*
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* Warning, horror ahead.
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*
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* The target code lives in our "secure ram", but u-boot doesn't know
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* that, and has blindly added reloc_off to every relocation
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* entry. Gahh. Do the opposite conversion. This hack also prevents
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* GCC from generating code veeners, which u-boot doesn't relocate at
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* all...
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*/
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#define secure_ram_addr(_fn) ({ \
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DECLARE_GLOBAL_DATA_PTR; \
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void *__fn = _fn; \
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typeof(_fn) *__tmp = (__fn - gd->reloc_off); \
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__tmp; \
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})
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#else
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#define secure_ram_addr(_fn) (_fn)
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#endif
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#endif
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