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/*
* Copyright (c) 2011, ARM Limited. All rights reserved.
*
* Redistribution and use in source and binary forms, with
* or without modification, are permitted provided that the
* following conditions are met:
*
* Redistributions of source code must retain the above
* copyright notice, this list of conditions and the
* following disclaimer.
*
* Redistributions in binary form must reproduce the
* above copyright notice, this list of conditions and
* the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* Neither the name of ARM nor the names of its
* contributors may be used to endorse or promote products
* derived from this software without specific prior written
* permission.
*/
#include "virt_helpers.h"
#include "gic_registers.h"
#include "misc.h"
#include "context.h"
/*
* Private data structure that maps each cpuid in a
* multicluster system to its physical cpu interface
* id when a shared vGIC is used.
*/
static unsigned int cpuif_map[MAX_CLUSTERS][MAX_CORES];
/*
* Private data structure that maps each cpu interface
* id to the corresponding cpuid & clusterid. In each
* entry top 4 bits store the cluster id while the bottom
* 4 store the cpuid.
*
* TODO:
* No real need for this data structure. Should be
* possible to get this info from the previous data
* structure and the knowledge of number of clusters
* and cpus from the KFSCB
*/
static unsigned int cpuinfo_map[MAX_CPUIFS];
/*
* IPI to use for cpu interface discovery.
*/
#define CPUIF_IPI 0xf
/*
* In the presence of the Switcher and the shared vGIC
* find the mapping between the cpu interface and the
* cpu id. This is required to:
* a) Set processor targets correctly during context
* save & restore and normal operation (IPI handling)
* b) Restoring the context of pending IPIs on the inbound
* cluster.
* Ideally a platform defined register should have done the
* trick. However, we rely on a software mechanism to obtain
* this information.
*
* Assumptions:
* a) Expected to be used only in the "Switching" case when
* there is a mismatch between the cpuids and the cpuif ids
* on the "other" cluster
* b) In the "Switching" case with external vGIC, the distributor
* interface should never get disabled.
* c) Always called in Secure world
*
* Idea is that, without disturbing the existing GIC state too
* much (outbound might be doing things with it), we need to
* ensure that only the IPI which we choose gets through our
* cpu interface. This should not be a problem as the SPIs will
* be targetted to the outbound cluster cpus & there will be no
* local peripheral interrupts expected. There is paranoia about
* getting IPIs from the outbound but this can be dealt with by
* manipulating the IPI priorities so that we only see what we
* want to see.
*
* TODO:
* Assuming no IPIs will be received at this point of time. So
* no changes will be made to the priority mask registers.
*/
unsigned map_cpuif(unsigned cluster_id, unsigned cpu_id)
{
unsigned cpuif_id = 0;
cpuif_id = bitindex(read32(GIC_ID_PHY_BASE + GICD_CPUS) & 0xff);
cpuif_map[cluster_id][cpu_id] = cpuif_id;
cpuinfo_map[cpuif_id] = (cluster_id << 4) | cpu_id;
return 0;
}
/*
* Given a cpu and cluster id find the cpu interface it maps to.
*/
unsigned get_cpuif(unsigned cluster_id, unsigned cpu_id)
{
return cpuif_map[cluster_id][cpu_id];
}
/*
* Given a cpu interface id, find what cpu and cluster id it maps to.
*/
unsigned get_cpuinfo(unsigned cpuif)
{
return cpuinfo_map[cpuif];
}
/*
* Given a cpu interface mask, find the corresponding cpuid mask on that cluster.
*/
unsigned get_cpu_mask(unsigned cpuif_mask)
{
unsigned num_bytes = sizeof(unsigned int) / sizeof(unsigned char), ctr;
unsigned cpuif = 0, clusterid = read_clusterid(), cpu_mask = 0;
unsigned cpuid = 0;
for (ctr = 0; ctr < num_bytes; ctr++) { /* Iterate through the cpu_mask byte wise */
unsigned byte = 0;
unsigned char lz = 0;
byte = (cpuif_mask >> (ctr << 3)) & 0xff;
while ((lz = __clz(byte)) != 0x20) {
cpuif = 31 - lz;
byte &= ~(1 << cpuif); /* Clear the bit just discovered */
cpuid = get_cpuinfo(cpuif) & 0xf;
cpu_mask |= (1 << cpuid) << (ctr << 3);
}
}
return cpu_mask;
}
/*
* Given a cpu mask, find the corresponding cpu interface mask on that cluster.
*/
unsigned get_cpuif_mask(unsigned cpu_mask)
{
unsigned num_bytes = sizeof(unsigned int) / sizeof(unsigned char), ctr;
unsigned cpuif = 0, clusterid = read_clusterid(), cpuif_mask = 0;
unsigned cpuid = 0;
for (ctr = 0; ctr < num_bytes; ctr++) { /* Iterate through the cpu_mask byte wise */
unsigned byte = 0;
unsigned char lz = 0;
byte = (cpu_mask >> (ctr << 3)) & 0xff;
while ((lz = __clz(byte)) != 0x20) {
cpuid = 31 - lz;
byte &= ~(1 << cpuid); /* Clear the bit just discovered */
cpuif = get_cpuif(clusterid, cpuid);
cpuif_mask |= (1 << cpuif) << (ctr << 3);
}
}
return cpuif_mask;
}
/*
* Given a cpu interface mask, find its corresponding mask on the other cluster
* NOTE: Creates the new mask in-place.
*/
#if 1
/*
* This is the fast version of remapping cpu interface ids to cpuids. Instead of
* remapping each bit (target interface) in the arg passed, it simply shifts all
* the bits by the number of cpus available.
*/
unsigned remap_cpuif(unsigned *cpuif_mask)
{
unsigned cluster_id = read_clusterid(), num_cpus = num_secondaries() + 1;
if(cluster_id == EAGLE)
*cpuif_mask = *cpuif_mask >> num_cpus;
else
*cpuif_mask = *cpuif_mask << num_cpus;
return 0;
}
#else
unsigned remap_cpuif(unsigned *cpuif_mask)
{
unsigned ib_cpuif_mask = 0, ob_cpuif = 0, ib_cpuif = 0, ob_cpuid =
0, ob_clusterid = 0, ib_cpuid = 0, ib_clusterid = 0;
unsigned num_bytes = sizeof(unsigned int) / sizeof(unsigned char), ctr;
for (ctr = 0; ctr < num_bytes; ctr++) {
unsigned byte = 0;
unsigned char lz = 0;
byte = (*cpuif_mask >> (ctr << 3)) & 0xff;
while ((lz = __clz(byte)) != 0x20) {
ob_cpuif = 31 - lz;
byte &= ~(1 << ob_cpuif); /* Clear the bit just discovered */
ob_cpuid = get_cpuinfo(ob_cpuif) & 0xf;
ob_clusterid = (get_cpuinfo(ob_cpuif) >> 4) & 0xf;
/*
* TODO: Can we assume that the inbound and outbound clusters will
* always be logical complements of each other
*/
ib_clusterid = !ob_clusterid;
/*
* TODO: Assuming that the cpuids have a 1:1 mapping i.e. cpuX on
* one cluster will always map to cpuX on the other cluster.
*/
ib_cpuid = ob_cpuid;
ib_cpuif = get_cpuif(ib_clusterid, ib_cpuid);
ib_cpuif_mask |= (1 << ib_cpuif) << (ctr << 3);
}
}
*cpuif_mask = ib_cpuif_mask;
return 0;
}
#endif
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