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Optimize EL3 register state stored in cpu_context structure

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This patch further optimizes the EL3 register state stored in
cpu_context. The 2 registers which are removed from cpu_context are:

  * cntfrq_el0 is the system timer register which is writable
    only in EL3 and it can be programmed during cold/warm boot. Hence
    it need not be saved to cpu_context.

  * cptr_el3 controls access to Trace, Floating-point, and Advanced
    SIMD functionality and it is programmed every time during cold
    and warm boot. The current BL3-1 implementation does not need to
    modify the access controls during normal execution and hence
    they are expected to remain static.

Fixes ARM-software/tf-issues#197

Change-Id: I599ceee3b73a7dcfd37069fd41b60e3d397a7b18
This commit is contained in:
Soby Mathew
2014-07-04 16:02:26 +01:00
parent dd2bdee616
commit fdfabec10c
5 changed files with 9 additions and 76 deletions
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6
include/bl31/context.h
View File

@@ -80,9 +80,7 @@
#define CTX_RUNTIME_SP 0x8
#define CTX_SPSR_EL3 0x10
#define CTX_ELR_EL3 0x18
#define CTX_CPTR_EL3 0x20
#define CTX_CNTFRQ_EL0 0x28
#define CTX_EL3STATE_END 0x30
#define CTX_EL3STATE_END 0x20
/*******************************************************************************
* Constants that allow assembler code to access members of and the
@@ -323,8 +321,6 @@ CASSERT(CTX_EL3STATE_OFFSET == __builtin_offsetof(cpu_context_t, el3state_ctx),
/*******************************************************************************
* Function prototypes
******************************************************************************/
void el3_sysregs_context_save(el3_state_t *regs);
void el3_sysregs_context_restore(el3_state_t *regs);
void el1_sysregs_context_save(el1_sys_regs_t *regs);
void el1_sysregs_context_restore(el1_sys_regs_t *regs);
#if CTX_INCLUDE_FPREGS

2
include/bl31/context_mgmt.h
View File

@@ -49,10 +49,8 @@ void cm_set_context_by_mpidr(uint64_t mpidr,
void *context,
uint32_t security_state);
static inline void cm_set_context(void *context, uint32_t security_state);
void cm_el3_sysregs_context_save(uint32_t security_state);
void cm_init_context(uint64_t mpidr, const struct entry_point_info *ep);
void cm_prepare_el3_exit(uint32_t security_state);
void cm_el3_sysregs_context_restore(uint32_t security_state);
void cm_el1_sysregs_context_save(uint32_t security_state);
void cm_el1_sysregs_context_restore(uint32_t security_state);
void cm_set_elr_el3(uint32_t security_state, uint64_t entrypoint);