Re: [PATCH v5 2/2] firmware: qcom: scm: Add support for ARM64 SoCs

Stephen Boyd
2015-08-06T01:27:27Z

On 04/28/2015 12:23 PM, Kumar Gala wrote:
> +
> +int __qcom_scm_call_armv8_64(u64 x0, u64 x1, u64 x2, u64 x3, u64 x4, u64 x5,
> + u64 *ret1, u64 *ret2, u64 *ret3)
> +{
> + register u64 r0 asm("r0") = x0;
> + register u64 r1 asm("r1") = x1;
> + register u64 r2 asm("r2") = x2;
> + register u64 r3 asm("r3") = x3;
> + register u64 r4 asm("r4") = x4;
> + register u64 r5 asm("r5") = x5;

This should set x6 to 0.

register u32 r6 asm("r6") = 0;

for example.

> +
> + do {
> + asm volatile(
> + __asmeq("%0", "x0")
> + __asmeq("%1", "x1")
> + __asmeq("%2", "x2")
> + __asmeq("%3", "x3")
> + __asmeq("%4", "x0")
> + __asmeq("%5", "x1")
> + __asmeq("%6", "x2")
> + __asmeq("%7", "x3")
> + __asmeq("%8", "x4")
> + __asmeq("%9", "x5")

And then the asmeq thing here for x6.

> +#ifdef REQUIRES_SEC
> + ".arch_extension sec\n"
> +#endif
> + "smc #0\n"
> + : "=r" (r0), "=r" (r1), "=r" (r2), "=r" (r3)
> + : "r" (r0), "r" (r1), "r" (r2), "r" (r3), "r" (r4),
> + "r" (r5)

And add x6 as an input here.

> + : "x6", "x7", "x8", "x9", "x10", "x11", "x12", "x13",

and remove x6 as a clobber.

> + "x14", "x15", "x16", "x17");
> + } while (r0 == QCOM_SCM_INTERRUPTED);
> +
> + if (ret1)
> + *ret1 = r1;
> + if (ret2)
> + *ret2 = r2;
> + if (ret3)
> + *ret3 = r3;
> +
> + return r0;
> +}
> +
> +int __qcom_scm_call_armv8_32(u32 w0, u32 w1, u32 w2, u32 w3, u32 w4, u32 w5,
> + u64 *ret1, u64 *ret2, u64 *ret3)
> +{
> + register u32 r0 asm("r0") = w0;
> + register u32 r1 asm("r1") = w1;
> + register u32 r2 asm("r2") = w2;
> + register u32 r3 asm("r3") = w3;
> + register u32 r4 asm("r4") = w4;
> + register u32 r5 asm("r5") = w5;

This needs to set r6 to 0 as well

register u32 r6 asm("r6") = 0;

for example.

> +
> + do {
> + asm volatile(
> + __asmeq("%0", "x0")
> + __asmeq("%1", "x1")
> + __asmeq("%2", "x2")
> + __asmeq("%3", "x3")
> + __asmeq("%4", "x0")
> + __asmeq("%5", "x1")
> + __asmeq("%6", "x2")
> + __asmeq("%7", "x3")
> + __asmeq("%8", "x4")
> + __asmeq("%9", "x5")

And then another asmeq thing here for x6.

> +#ifdef REQUIRES_SEC
> + ".arch_extension sec\n"
> +#endif
> + "smc #0\n"
> + : "=r" (r0), "=r" (r1), "=r" (r2), "=r" (r3)
> + : "r" (r0), "r" (r1), "r" (r2), "r" (r3), "r" (r4),
> + "r" (r5)

And then add r6 here as an input

> + : "x6", "x7", "x8", "x9", "x10", "x11", "x12", "x13",

And remove r6 from the clobber.

> + "x14", "x15", "x16", "x17");
> +
> + } while (r0 == QCOM_SCM_INTERRUPTED);
> +
> + if (ret1)
> + *ret1 = r1;
> + if (ret2)
> + *ret2 = r2;
> + if (ret3)
> + *ret3 = r3;
> +
> + return r0;
> +}
> +
>

Here's a totally untested patch for that.

Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
----8<-----

diff --git a/drivers/firmware/qcom_scm-64.c b/drivers/firmware/qcom_scm-64.c
index a95fd9b5d576..8f7e65ff524c 100644
--- a/drivers/firmware/qcom_scm-64.c
+++ b/drivers/firmware/qcom_scm-64.c
@@ -114,6 +114,7 @@ int __qcom_scm_call_armv8_64(u64 x0, u64 x1, u64 x2, u64 x3, u64 x4, u64 x5,
register u64 r3 asm("r3") = x3;
register u64 r4 asm("r4") = x4;
register u64 r5 asm("r5") = x5;
+ register u64 r6 asm("r5") = 0;

do {
asm volatile(
@@ -127,14 +128,15 @@ int __qcom_scm_call_armv8_64(u64 x0, u64 x1, u64 x2, u64 x3, u64 x4, u64 x5,
__asmeq("%7", "x3")
__asmeq("%8", "x4")
__asmeq("%9", "x5")
+ __asmeq("%10", "x6")
#ifdef REQUIRES_SEC
".arch_extension sec\n"
#endif
"smc #0\n"
: "=r" (r0), "=r" (r1), "=r" (r2), "=r" (r3)
: "r" (r0), "r" (r1), "r" (r2), "r" (r3), "r" (r4),
- "r" (r5)
- : "x6", "x7", "x8", "x9", "x10", "x11", "x12", "x13",
+ "r" (r5), "r" (r6)
+ : "x7", "x8", "x9", "x10", "x11", "x12", "x13",
"x14", "x15", "x16", "x17");
} while (r0 == QCOM_SCM_INTERRUPTED);

@@ -157,6 +159,7 @@ int __qcom_scm_call_armv8_32(u32 w0, u32 w1, u32 w2, u32 w3, u32 w4, u32 w5,
register u32 r3 asm("r3") = w3;
register u32 r4 asm("r4") = w4;
register u32 r5 asm("r5") = w5;
+ register u32 r6 asm("r6") = 0;

do {
asm volatile(
@@ -170,14 +173,15 @@ int __qcom_scm_call_armv8_32(u32 w0, u32 w1, u32 w2, u32 w3, u32 w4, u32 w5,
__asmeq("%7", "x3")
__asmeq("%8", "x4")
__asmeq("%9", "x5")
+ __asmeq("%10", "x6")
#ifdef REQUIRES_SEC
".arch_extension sec\n"
#endif
"smc #0\n"
: "=r" (r0), "=r" (r1), "=r" (r2), "=r" (r3)
: "r" (r0), "r" (r1), "r" (r2), "r" (r3), "r" (r4),
- "r" (r5)
- : "x6", "x7", "x8", "x9", "x10", "x11", "x12", "x13",
+ "r" (r5), "r" (r6)
+ : "x7", "x8", "x9", "x10", "x11", "x12", "x13",
"x14", "x15", "x16", "x17");

} while (r0 == QCOM_SCM_INTERRUPTED);

--
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