From 9bc884b741d3ab5bc3471a5cbccc38480676bf2b Mon Sep 17 00:00:00 2001 From: David Gibson Date: Mon, 10 Oct 2011 18:31:00 +0000 Subject: ppc: Generalize the kvmppc_get_clockfreq() function Currently the kvmppc_get_clockfreq() function reads the host's clock frequency from /proc/device-tree, which is useful to past to the guest in KVM setups. However, there are some other host properties advertised in the device tree which can also be relevant to the guests. This patch, therefore, replaces kvmppc_get_clockfreq() which can retrieve any named, single integer property from the host device tree's CPU node. Signed-off-by: David Gibson Signed-off-by: Alexander Graf --- target-ppc/kvm.c | 35 ++++++++++++++++++++++++----------- 1 file changed, 24 insertions(+), 11 deletions(-) (limited to 'target-ppc/kvm.c') diff --git a/target-ppc/kvm.c b/target-ppc/kvm.c index 06cad41..c48cd76 100644 --- a/target-ppc/kvm.c +++ b/target-ppc/kvm.c @@ -650,37 +650,50 @@ static int kvmppc_find_cpu_dt(char *buf, int buf_len) return 0; } -uint64_t kvmppc_get_clockfreq(void) +/* Read a CPU node property from the host device tree that's a single + * integer (32-bit or 64-bit). Returns 0 if anything goes wrong + * (can't find or open the property, or doesn't understand the + * format) */ +static uint64_t kvmppc_read_int_cpu_dt(const char *propname) { - char buf[512]; - uint32_t tb[2]; + char buf[PATH_MAX]; + union { + uint32_t v32; + uint64_t v64; + } u; FILE *f; int len; if (kvmppc_find_cpu_dt(buf, sizeof(buf))) { - return 0; + return -1; } - strncat(buf, "/clock-frequency", sizeof(buf) - strlen(buf)); + strncat(buf, "/", sizeof(buf) - strlen(buf)); + strncat(buf, propname, sizeof(buf) - strlen(buf)); f = fopen(buf, "rb"); if (!f) { return -1; } - len = fread(tb, sizeof(tb[0]), 2, f); + len = fread(&u, 1, sizeof(u), f); fclose(f); switch (len) { - case 1: - /* freq is only a single cell */ - return tb[0]; - case 2: - return *(uint64_t*)tb; + case 4: + /* property is a 32-bit quantity */ + return be32_to_cpu(u.v32); + case 8: + return be64_to_cpu(u.v64); } return 0; } +uint64_t kvmppc_get_clockfreq(void) +{ + return kvmppc_read_int_cpu_dt("clock-frequency"); +} + int kvmppc_get_hypercall(CPUState *env, uint8_t *buf, int buf_len) { uint32_t *hc = (uint32_t*)buf; -- cgit v1.1