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Add support to get the cpu ID from its device driver in a generic way.

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This will be needed by arm64 to find the value to pass to the psci (Power
State Coordination Interface) driver, among other things, used to enable
cores.

Differential Revision:	https://reviews.freebsd.org/D1824
Reviewed by:	imp
Sponsored by:	The FreeBSD Foundation
This commit is contained in:
Andrew Turner 2015-02-19 12:47:48 +00:00
parent aeca5b8bc9
commit deb7728379
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=278998
2 changed files with 27 additions and 0 deletions
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11
sys/dev/ofw/ofw_cpu.c
View File

@ -244,6 +244,7 @@ ofw_cpu_attach(device_t dev)
static int
ofw_cpu_read_ivar(device_t dev, device_t child, int index, uintptr_t *result)
{
struct ofw_cpulist_softc *psc;
struct ofw_cpu_softc *sc;
sc = device_get_softc(dev);
@ -258,6 +259,16 @@ ofw_cpu_read_ivar(device_t dev, device_t child, int index, uintptr_t *result)
return (0);
}
break;
case CPU_IVAR_CPUID_SIZE:
psc = device_get_softc(device_get_parent(dev));
*result = psc->sc_addr_cells;
return (0);
case CPU_IVAR_CPUID:
if (sc->sc_reg_valid) {
*result = (uintptr_t)sc->sc_reg;
return (0);
}
break;
}
return (ENOENT);

16
sys/sys/cpu.h
View File

@ -37,6 +37,8 @@
#define CPU_IVAR_PCPU 1
#define CPU_IVAR_NOMINAL_MHZ 2
#define CPU_IVAR_CPUID_SIZE 3
#define CPU_IVAR_CPUID 4
static __inline struct pcpu *cpu_get_pcpu(device_t dev)
{
@ -54,6 +56,20 @@ static __inline int32_t cpu_get_nominal_mhz(device_t dev)
return ((int32_t)v);
}
static __inline const uint32_t *cpu_get_cpuid(device_t dev, size_t *count)
{
uintptr_t v = 0;
if (BUS_READ_IVAR(device_get_parent(dev), dev,
CPU_IVAR_CPUID_SIZE, &v) != 0)
return (NULL);
*count = (size_t)v;
if (BUS_READ_IVAR(device_get_parent(dev), dev,
CPU_IVAR_CPUID, &v) != 0)
return (NULL);
return ((const uint32_t *)v);
}
/*
* CPU frequency control interface.
*/