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/*
* Copyright (c) 2012, 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 "virtualisor.h"
#include "events.h"
#include "misc.h"
#include "cache_geom.h"
#include "mem_trap.h"
#include "gic_registers.h"
virt_reg_data host_virt_regs[NUM_CPUS];
reg_trap_data host_trap_regs[NUM_CPUS];
cache_geometry host_cache_geometry[NUM_CPUS];
cache_geometry target_cache_geometry[NUM_CPUS];
/* Cache geometry differences for each cpu at each level */
cache_diff cache_delta[NUM_CPUS][MAX_CACHE_LEVELS];
static mem_trap_data svgic_distif_trap
__attribute__ ((section("s2_trap_section"))) = {
0, 0x0, 0x0, 0x0, 0x0, 0x0,};
/*
* Flags which indicate whether the cpu independent
* functionality of the Virtualisor has been setup
* on both the host and target clusters.
*/
static unsigned virt_init[NUM_CPUS];
/*
* Detect the type of dual cluster system we are, read
* our cpu type and then use the KFS_ID register to
* return the type of cpu on the other cluster.
*/
unsigned find_sibling_cpu()
{
unsigned cpu_no = PART_NO(read_midr());
switch (DC_SYSTYPE) {
case A15_A15:
if (cpu_no == A15)
return cpu_no;
break;
case A7_A15:
case A15_A7:
if (cpu_no == A15)
return A7;
else if (cpu_no == A7)
return A15;
else
break;
}
printf("Unsupported Dual cluster system : 0x%x\n", DC_SYSTYPE);
panic();
return 0;
}
void SetupVirtualisor(unsigned first_cpu)
{
unsigned rc = 0, cpu_id = read_cpuid(), cpu_no = PART_NO(read_midr());
unsigned vd_len = 0, index = 0, cluster_id = read_clusterid();
virt_descriptor *vd_array = &virt_desc_section$$Base;
unsigned (*handler) (unsigned, unsigned) = 0x0, sibling;
unsigned sibling_cpuid = 0, abs_cpuid = 0;
if (!switcher) {
sibling_cpuid = abs_cpuid(cpu_id, !cluster_id);
abs_cpuid = abs_cpuid(cpu_id, cluster_id);
}
/* Find our brother from another mother */
sibling = find_sibling_cpu();
/*
* Do the generic trap setup
*/
if (virt_init[cpu_id] == FALSE) {
/*
* In the "always-on" configuration, both clusters have
* ensure that the L2CTLR register includes the cpu count
* of both the clusters while reporting the number of
* secondary cpus. So setup the necessary trap.
*/
if (!switcher) {
/*
* Enable traps to CRn = 9 cp15 space
*/
write_hstr(read_hstr() | (1 << 9));
}
/*
* Cache geometry of each cpu on the host cluster needs
* to be virtualised if the cpu type is different from
* that on the target cluster. This can be done generic-
* ally.
*/
if (cpu_no != sibling) {
rc = map_cache_geometries(&host_cache_geometry[cpu_id],
&target_cache_geometry
[cpu_id],
&cache_delta[cpu_id][0]);
if (rc) {
printf("%s: Failed to map cache geometries \n",
__FUNCTION__);
rc = 1;
goto out;
}
}
/*
* If the two clusters have different cpu types, then the
* target saves its midr and the host uses the value to
* virtualise its midr.
* mpidr is virtualised on the host cluster whether we are
* running "always on" or "switching". The latter cares
* about the cluster id while the former cares about the
* cpu ids as well.
*/
if (cluster_id != host_cluster) {
host_virt_regs[cpu_id].mpidr = read_mpidr();
if (cpu_no != sibling)
host_virt_regs[cpu_id].midr = read_midr();
if (!switcher) {
/*
* Send a signal to the host to indicate
* that the regs is ready to be read. The
* cpu id is the absolute cpu number across
* clusters.
*/
set_event(VID_REGS_DONE, sibling_cpuid);
}
} else {
if (!switcher) {
/*
* Wait for the target to read its regs
* before using them.
*/
wait_for_event(VID_REGS_DONE, abs_cpuid);
reset_event(VID_REGS_DONE, abs_cpuid);
/*
* Add number of cpus in the target cluster to
* the cpuid of this cpu.
*/
host_virt_regs[cpu_id].mpidr +=
CLUSTER_CPU_COUNT(!host_cluster);
}
write_vmpidr(host_virt_regs[cpu_id].mpidr);
if (cpu_no != sibling)
write_vmidr(host_virt_regs[cpu_id].midr);
}
if (cluster_id == host_cluster) {
/*
* Assuming that with the switcher, the host always
* runs after the target. So, if we are here then
* the target must have completed its initialisation
*
* In the other case, if we are here after exchanging
* the events above, then the target has finished
* initialising.
*/
virt_init[cpu_id] = 1;
}
} else {
if (switcher)
RestoreVirtualisor(first_cpu);
}
/*
* Do the cpu specific initialisation (if any)
*/
vd_len = (unsigned)&virt_desc_section$$Length;
for (index = 0; index < (vd_len / sizeof(virt_descriptor)); index++) {
if (cpu_no == vd_array[index].cpu_no) {
/* If not initialised then setup else restore */
if (vd_array[index].init[cpu_id] == 0)
handler = vd_array[index].trap_setup;
else
handler = vd_array[index].trap_restore;
if (handler) {
rc = handler(first_cpu, sibling);
if (rc) {
printf("%s: failed on cpu%d \n",
__FUNCTION__, cpu_no);
goto out;
}
}
}
}
out:
if (rc) {
printf("%s: Failed : Cpu%d : Host=0x%x : Target=0x%x\n ",
__FUNCTION__, cpu_id, cpu_no, sibling);
panic();
}
return;
}
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