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vppinfra: initial RISC-V support

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Type: feature
Change-Id: I1314d60fc420366526efaddd1ed215cf5f8b75dd
Signed-off-by: Damjan Marion <damarion@cisco.com>
This commit is contained in:
Damjan Marion
2021-10-31 19:04:33 +01:00
committed by Damjan Marion
parent 1e6d30bd44
commit 6eb0f84e37
4 changed files with 65 additions and 1 deletions
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50
src/vppinfra/longjmp.S
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@@ -816,6 +816,56 @@ cdecl(clib_calljmp):
mov sp, x3
ret
.size cdecl(clib_calljmp), .-cdecl(clib_calljmp)
#elif defined(__riscv)
#define foreach_0_to_11 _(0) _(1) _(2) _(3) _(4) _(5) _(6) _(7) _(8) _(9) _(10) _(11)
.global cdecl(clib_setjmp)
.align 1
.type cdecl(clib_setjmp), @function
cdecl(clib_setjmp):
sd ra, 0*8(a0)
sd sp, 1*8(a0)
#define _(x) sd s##x, (x + 2)*8(a0);
foreach_0_to_11
#undef _
#define _(x) fsd fs##x, (x + 14)*8(a0);
foreach_0_to_11
#undef _
mv a0,a1
ret
.size cdecl(clib_setjmp), .-cdecl(clib_setjmp)
.global cdecl(clib_longjmp)
.align 1
.type cdecl(clib_longjmp), @function
cdecl(clib_longjmp):
ld ra, 0*8(a0)
ld sp, 1*8(a0)
#define _(x) ld s##x, (x + 2)*8(a0);
foreach_0_to_11
#undef _
#define _(x) fld fs##x, (x + 14)*8(a0);
foreach_0_to_11
#undef _
mv a0,a1
ret
.size cdecl(clib_longjmp), .-cdecl(clib_longjmp)
.global cdecl(clib_calljmp)
.align 1
.type cdecl(clib_calljmp), @function
cdecl(clib_calljmp):
andi a2,a2, -16 /* Make sure stack is 16-byte aligned. */
addi a2, a2, -16 /* allocate space on the new stack */
sd ra, 8(a2) /* store return address */
sd sp, 0(a2) /* store existing stack pointer */
mv sp, a2 /* change stack */
mv a2, a0 /* functon pointer to a2 */
mv a0, a1 /* 2nd argument becomes 1st one */
jalr a2 /* function call */
ld ra, 8(sp) /* restore old return address */
ld sp, 0(sp) /* restore old stack pointer */
ret
.size cdecl(clib_calljmp), .-cdecl(clib_calljmp)
#else
#error "unknown machine"
#endif

3
src/vppinfra/longjmp.h
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@@ -95,6 +95,9 @@
#define CLIB_ARCH_LONGJMP_REGS (22)
#elif defined(_mips) && __mips == 64
#define CLIB_ARCH_LONGJMP_REGS (12)
#elif defined(__riscv)
/* ra, sp, s0-s11, fs0-fs11 */
#define CLIB_ARCH_LONGJMP_REGS (26)
#else
#error "unknown machine"
#endif

9
src/vppinfra/time.h
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@@ -192,6 +192,15 @@ clib_cpu_time_now (void)
return result;
}
#elif defined(__riscv)
always_inline u64
clib_cpu_time_now (void)
{
u64 result;
asm volatile("rdcycle %0\n" : "=r"(result));
return result;
}
#else
#error "don't know how to read CPU time stamp"

4
src/vppinfra/types.h
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@@ -73,7 +73,9 @@ typedef unsigned int u32;
typedef unsigned long long u64;
#endif /* CLIB_AVOID_CLASH_WITH_LINUX_TYPES */
#elif defined(alpha) || (defined(_mips) && __mips == 64) || defined(__x86_64__) || defined (__powerpc64__) || defined (__aarch64__)
#elif defined(alpha) || (defined(_mips) && __mips == 64) || \
defined(__x86_64__) || defined(__powerpc64__) || defined(__aarch64__) || \
(defined(__riscv) && __riscv_xlen == 64)
typedef signed int i32;
typedef signed long i64;