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arm: cmsis: Convert relocate_vector_table to use CMSIS

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Replace _scs_relocate_vector_table with direct CMSIS register access and
use of __ISB/__DSB routinues.  We also cleanup the code a little bit to
just have one implentation of relocate_vector_table() on ARMv7-M.

Jira: ZEP-1568

Change-Id: I088c30e680a7ba198c1527a5822114b70f10c510
Signed-off-by: Kumar Gala <kumar.gala@linaro.org>
This commit is contained in:
Kumar Gala 2017-01-18 11:33:21 -06:00
commit 6782c3ea23
2 changed files with 6 additions and 40 deletions
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15
arch/arm/core/cortex_m/prep_c.c
View file

@ -27,19 +27,16 @@
static inline void relocate_vector_table(void) { /* do nothing */ }
#elif defined(CONFIG_ARMV7_M)
#ifdef CONFIG_XIP
static inline void relocate_vector_table(void)
{
/* vector table is located at the the beginning of the flash */
_scs_relocate_vector_table((void *)(CONFIG_FLASH_BASE_ADDRESS +
CONFIG_TEXT_SECTION_OFFSET));
}
#define VECTOR_ADDRESS (CONFIG_FLASH_BASE_ADDRESS + CONFIG_TEXT_SECTION_OFFSET)
#else
#define VECTOR_ADDRESS CONFIG_SRAM_BASE_ADDRESS
#endif
static inline void relocate_vector_table(void)
{
/* vector table is already in SRAM, just point to it */
_scs_relocate_vector_table((void *)CONFIG_SRAM_BASE_ADDRESS);
SCB->VTOR = VECTOR_ADDRESS & SCB_VTOR_TBLOFF_Msk;
__DSB();
__ISB();
}
#endif
#else
#error Unknown ARM architecture
#endif /* CONFIG_ARMv6_M */

31
include/arch/arm/cortex_m/scs.h
View file

@ -589,37 +589,6 @@ extern volatile struct __scs __scs;
#error Unknown ARM architecture
#endif /* CONFIG_ARMV6_M */
/* API */
#if defined(CONFIG_ARMV6_M)
#elif defined(CONFIG_ARMV7_M)
/**
*
* @brief Relocate the vector table
*
* Set the address of the vector table to the new address @a new_addr provided.
*
* It must be aligned on a 128-byte boundary.
*
* This routine must be called with interrupts locked and all sources of
* interrupts disabled.
*
* @param new_addr The new address of the vector table.
*
* @return N/A
*/
static inline void _scs_relocate_vector_table(void *new_addr)
{
__scs.scb.vtor.val = ((uint32_t)new_addr & 0xffffff80);
__asm__ volatile(
"dsb\n\t"
"isb\n\t"
:::);
}
#else
#error Unknown ARM architecture
#endif /* CONFIG_ARMV6_M */
#endif /* _ASMLANGUAGE */
#ifdef __cplusplus