Browse Source

armv7m: detect floating point feature

This patch add fp feature detection on cortex-m4.

Change-Id: I99e9d1bf5534630a22b8ad9c878165683db2d0ba
Signed-off-by: Mathias K <kesmtp@freenet.de>
Reviewed-on: http://openocd.zylin.com/524
Tested-by: jenkins
Reviewed-by: Spencer Oliver <spen@spen-soft.co.uk>
tags/v0.6.0-rc1
Mathias K 12 years ago
committed by Spencer Oliver
parent
commit
861df4574d
3 changed files with 27 additions and 1 deletions
  1. +1
    -0
      src/target/armv7m.c
  2. +7
    -0
      src/target/armv7m.h
  3. +19
    -1
      src/target/cortex_m.c

+ 1
- 0
src/target/armv7m.c View File

@@ -578,6 +578,7 @@ int armv7m_init_arch_info(struct target *target, struct armv7m_common *armv7m)
struct arm *arm = &armv7m->arm;

armv7m->common_magic = ARMV7M_COMMON_MAGIC;
armv7m->fp_feature = FP_NONE;

arm->core_type = ARM_MODE_THREAD;
arm->arch_info = armv7m;


+ 7
- 0
src/target/armv7m.h View File

@@ -97,6 +97,11 @@ enum {
ARMV7M_LAST_REG,
};

enum {
FP_NONE = 0,
FPv4_SP,
};

#define ARMV7M_COMMON_MAGIC 0x2A452A45

struct armv7m_common {
@@ -108,6 +113,8 @@ struct armv7m_common {
int exception_number;
struct adiv5_dap dap;

int fp_feature;

uint32_t demcr;

/* Direct processor core register read and writes */


+ 19
- 1
src/target/cortex_m.c View File

@@ -1756,13 +1756,20 @@ fail1:
*/
}

#define MVFR0 0xe000ef40
#define MVFR1 0xe000ef44

#define MVFR0_DEFAULT_M4 0x10110021
#define MVFR1_DEFAULT_M4 0x11000011

int cortex_m3_examine(struct target *target)
{
int retval;
uint32_t cpuid, fpcr;
uint32_t cpuid, fpcr, mvfr0, mvfr1;
int i;
struct cortex_m3_common *cortex_m3 = target_to_cm3(target);
struct adiv5_dap *swjdp = &cortex_m3->armv7m.dap;
struct armv7m_common *armv7m = target_to_armv7m(target);

retval = ahbap_debugport_init(swjdp);
if (retval != ERROR_OK)
@@ -1783,6 +1790,17 @@ int cortex_m3_examine(struct target *target)
i, (uint8_t)((cpuid >> 20) & 0xf), (uint8_t)((cpuid >> 0) & 0xf));
LOG_DEBUG("cpuid: 0x%8.8" PRIx32 "", cpuid);

/* test for floating point feature on cortex-m4 */
if (i == 4) {
target_read_u32(target, MVFR0, &mvfr0);
target_read_u32(target, MVFR1, &mvfr1);

if ((mvfr0 == MVFR0_DEFAULT_M4) && (mvfr1 == MVFR1_DEFAULT_M4)) {
LOG_DEBUG("Cortex-M%d floating point feature FPv4_SP found", i);
armv7m->fp_feature = FPv4_SP;
}
}

/* NOTE: FPB and DWT are both optional. */

/* Setup FPB */


Loading…
Cancel
Save