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| author | Sebastian Huber <sebastian.huber@embedded-brains.de> | 2013-05-08 09:30:31 +0200 |
|---|---|---|
| committer | Sebastian Huber <sebastian.huber@embedded-brains.de> | 2013-05-10 12:10:14 +0200 |
| commit | cfd8d7a3d73a10ae7cdbbfe5eb39839c46a5c77e (patch) | |
| tree | 5b694eb680b61129908a274b218d5f67fa0d34d6 /c/src/lib/libbsp/arm/shared/start/start.S | |
| parent | arm: Simplify architecture selection (diff) | |
| download | rtems-cfd8d7a3d73a10ae7cdbbfe5eb39839c46a5c77e.tar.bz2 | |
arm: Support VFP-D32 and Neon
Diffstat (limited to 'c/src/lib/libbsp/arm/shared/start/start.S')
| -rw-r--r-- | c/src/lib/libbsp/arm/shared/start/start.S | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/c/src/lib/libbsp/arm/shared/start/start.S b/c/src/lib/libbsp/arm/shared/start/start.S index cb91d41494..e79a5fc503 100644 --- a/c/src/lib/libbsp/arm/shared/start/start.S +++ b/c/src/lib/libbsp/arm/shared/start/start.S @@ -154,6 +154,26 @@ _start: /* Stay in SVC mode */ +#ifdef ARM_MULTILIB_VFP_D32 + /* Read CPACR */ + mrc p15, 0, r0, c1, c0, 2 + + /* Enable CP10 and CP11 */ + orr r0, r0, #(1 << 20) + orr r0, r0, #(1 << 22) + + /* Clear ASEDIS and D32DIS */ + bic r0, r0, #(3 << 30) + + /* Write CPACR */ + mcr p15, 0, r0, c1, c0, 2 + isb + + /* Enable FPU */ + mov r0, #(1 << 30) + vmsr FPEXC, r0 +#endif + /* * Branch to start hook 0. * |