247 строки
6.4 KiB
C
247 строки
6.4 KiB
C
/*
|
|
* c 2001 PPC 64 Team, IBM Corp
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version
|
|
* 2 of the License, or (at your option) any later version.
|
|
*/
|
|
|
|
#include <linux/smp.h>
|
|
#include <linux/export.h>
|
|
#include <linux/memblock.h>
|
|
|
|
#include <asm/lppaca.h>
|
|
#include <asm/paca.h>
|
|
#include <asm/sections.h>
|
|
#include <asm/pgtable.h>
|
|
#include <asm/kexec.h>
|
|
|
|
#ifdef CONFIG_PPC_BOOK3S
|
|
|
|
/*
|
|
* The structure which the hypervisor knows about - this structure
|
|
* should not cross a page boundary. The vpa_init/register_vpa call
|
|
* is now known to fail if the lppaca structure crosses a page
|
|
* boundary. The lppaca is also used on POWER5 pSeries boxes.
|
|
* The lppaca is 640 bytes long, and cannot readily
|
|
* change since the hypervisor knows its layout, so a 1kB alignment
|
|
* will suffice to ensure that it doesn't cross a page boundary.
|
|
*/
|
|
struct lppaca lppaca[] = {
|
|
[0 ... (NR_LPPACAS-1)] = {
|
|
.desc = cpu_to_be32(0xd397d781), /* "LpPa" */
|
|
.size = cpu_to_be16(sizeof(struct lppaca)),
|
|
.fpregs_in_use = 1,
|
|
.slb_count = cpu_to_be16(64),
|
|
.vmxregs_in_use = 0,
|
|
.page_ins = 0,
|
|
},
|
|
};
|
|
|
|
static struct lppaca *extra_lppacas;
|
|
static long __initdata lppaca_size;
|
|
|
|
static void __init allocate_lppacas(int nr_cpus, unsigned long limit)
|
|
{
|
|
if (nr_cpus <= NR_LPPACAS)
|
|
return;
|
|
|
|
lppaca_size = PAGE_ALIGN(sizeof(struct lppaca) *
|
|
(nr_cpus - NR_LPPACAS));
|
|
extra_lppacas = __va(memblock_alloc_base(lppaca_size,
|
|
PAGE_SIZE, limit));
|
|
}
|
|
|
|
static struct lppaca * __init new_lppaca(int cpu)
|
|
{
|
|
struct lppaca *lp;
|
|
|
|
if (cpu < NR_LPPACAS)
|
|
return &lppaca[cpu];
|
|
|
|
lp = extra_lppacas + (cpu - NR_LPPACAS);
|
|
*lp = lppaca[0];
|
|
|
|
return lp;
|
|
}
|
|
|
|
static void __init free_lppacas(void)
|
|
{
|
|
long new_size = 0, nr;
|
|
|
|
if (!lppaca_size)
|
|
return;
|
|
nr = num_possible_cpus() - NR_LPPACAS;
|
|
if (nr > 0)
|
|
new_size = PAGE_ALIGN(nr * sizeof(struct lppaca));
|
|
if (new_size >= lppaca_size)
|
|
return;
|
|
|
|
memblock_free(__pa(extra_lppacas) + new_size, lppaca_size - new_size);
|
|
lppaca_size = new_size;
|
|
}
|
|
|
|
#else
|
|
|
|
static inline void allocate_lppacas(int nr_cpus, unsigned long limit) { }
|
|
static inline void free_lppacas(void) { }
|
|
|
|
#endif /* CONFIG_PPC_BOOK3S */
|
|
|
|
#ifdef CONFIG_PPC_STD_MMU_64
|
|
|
|
/*
|
|
* 3 persistent SLBs are registered here. The buffer will be zero
|
|
* initially, hence will all be invaild until we actually write them.
|
|
*
|
|
* If you make the number of persistent SLB entries dynamic, please also
|
|
* update PR KVM to flush and restore them accordingly.
|
|
*/
|
|
static struct slb_shadow *slb_shadow;
|
|
|
|
static void __init allocate_slb_shadows(int nr_cpus, int limit)
|
|
{
|
|
int size = PAGE_ALIGN(sizeof(struct slb_shadow) * nr_cpus);
|
|
slb_shadow = __va(memblock_alloc_base(size, PAGE_SIZE, limit));
|
|
memset(slb_shadow, 0, size);
|
|
}
|
|
|
|
static struct slb_shadow * __init init_slb_shadow(int cpu)
|
|
{
|
|
struct slb_shadow *s = &slb_shadow[cpu];
|
|
|
|
/*
|
|
* When we come through here to initialise boot_paca, the slb_shadow
|
|
* buffers are not allocated yet. That's OK, we'll get one later in
|
|
* boot, but make sure we don't corrupt memory at 0.
|
|
*/
|
|
if (!slb_shadow)
|
|
return NULL;
|
|
|
|
s->persistent = cpu_to_be32(SLB_NUM_BOLTED);
|
|
s->buffer_length = cpu_to_be32(sizeof(*s));
|
|
|
|
return s;
|
|
}
|
|
|
|
#else /* CONFIG_PPC_STD_MMU_64 */
|
|
|
|
static void __init allocate_slb_shadows(int nr_cpus, int limit) { }
|
|
|
|
#endif /* CONFIG_PPC_STD_MMU_64 */
|
|
|
|
/* The Paca is an array with one entry per processor. Each contains an
|
|
* lppaca, which contains the information shared between the
|
|
* hypervisor and Linux.
|
|
* On systems with hardware multi-threading, there are two threads
|
|
* per processor. The Paca array must contain an entry for each thread.
|
|
* The VPD Areas will give a max logical processors = 2 * max physical
|
|
* processors. The processor VPD array needs one entry per physical
|
|
* processor (not thread).
|
|
*/
|
|
struct paca_struct *paca;
|
|
EXPORT_SYMBOL(paca);
|
|
|
|
void __init initialise_paca(struct paca_struct *new_paca, int cpu)
|
|
{
|
|
#ifdef CONFIG_PPC_BOOK3S
|
|
new_paca->lppaca_ptr = new_lppaca(cpu);
|
|
#else
|
|
new_paca->kernel_pgd = swapper_pg_dir;
|
|
#endif
|
|
new_paca->lock_token = 0x8000;
|
|
new_paca->paca_index = cpu;
|
|
new_paca->kernel_toc = kernel_toc_addr();
|
|
new_paca->kernelbase = (unsigned long) _stext;
|
|
/* Only set MSR:IR/DR when MMU is initialized */
|
|
new_paca->kernel_msr = MSR_KERNEL & ~(MSR_IR | MSR_DR);
|
|
new_paca->hw_cpu_id = 0xffff;
|
|
new_paca->kexec_state = KEXEC_STATE_NONE;
|
|
new_paca->__current = &init_task;
|
|
new_paca->data_offset = 0xfeeeeeeeeeeeeeeeULL;
|
|
#ifdef CONFIG_PPC_STD_MMU_64
|
|
new_paca->slb_shadow_ptr = init_slb_shadow(cpu);
|
|
#endif /* CONFIG_PPC_STD_MMU_64 */
|
|
|
|
#ifdef CONFIG_PPC_BOOK3E
|
|
/* For now -- if we have threads this will be adjusted later */
|
|
new_paca->tcd_ptr = &new_paca->tcd;
|
|
#endif
|
|
}
|
|
|
|
/* Put the paca pointer into r13 and SPRG_PACA */
|
|
void setup_paca(struct paca_struct *new_paca)
|
|
{
|
|
/* Setup r13 */
|
|
local_paca = new_paca;
|
|
|
|
#ifdef CONFIG_PPC_BOOK3E
|
|
/* On Book3E, initialize the TLB miss exception frames */
|
|
mtspr(SPRN_SPRG_TLB_EXFRAME, local_paca->extlb);
|
|
#else
|
|
/* In HV mode, we setup both HPACA and PACA to avoid problems
|
|
* if we do a GET_PACA() before the feature fixups have been
|
|
* applied
|
|
*/
|
|
if (early_cpu_has_feature(CPU_FTR_HVMODE))
|
|
mtspr(SPRN_SPRG_HPACA, local_paca);
|
|
#endif
|
|
mtspr(SPRN_SPRG_PACA, local_paca);
|
|
|
|
}
|
|
|
|
static int __initdata paca_size;
|
|
|
|
void __init allocate_pacas(void)
|
|
{
|
|
u64 limit;
|
|
int cpu;
|
|
|
|
limit = ppc64_rma_size;
|
|
|
|
#ifdef CONFIG_PPC_BOOK3S_64
|
|
/*
|
|
* We can't take SLB misses on the paca, and we want to access them
|
|
* in real mode, so allocate them within the RMA and also within
|
|
* the first segment.
|
|
*/
|
|
limit = min(0x10000000ULL, limit);
|
|
#endif
|
|
|
|
paca_size = PAGE_ALIGN(sizeof(struct paca_struct) * nr_cpu_ids);
|
|
|
|
paca = __va(memblock_alloc_base(paca_size, PAGE_SIZE, limit));
|
|
memset(paca, 0, paca_size);
|
|
|
|
printk(KERN_DEBUG "Allocated %u bytes for %d pacas at %p\n",
|
|
paca_size, nr_cpu_ids, paca);
|
|
|
|
allocate_lppacas(nr_cpu_ids, limit);
|
|
|
|
allocate_slb_shadows(nr_cpu_ids, limit);
|
|
|
|
/* Can't use for_each_*_cpu, as they aren't functional yet */
|
|
for (cpu = 0; cpu < nr_cpu_ids; cpu++)
|
|
initialise_paca(&paca[cpu], cpu);
|
|
}
|
|
|
|
void __init free_unused_pacas(void)
|
|
{
|
|
int new_size;
|
|
|
|
new_size = PAGE_ALIGN(sizeof(struct paca_struct) * nr_cpu_ids);
|
|
|
|
if (new_size >= paca_size)
|
|
return;
|
|
|
|
memblock_free(__pa(paca) + new_size, paca_size - new_size);
|
|
|
|
printk(KERN_DEBUG "Freed %u bytes for unused pacas\n",
|
|
paca_size - new_size);
|
|
|
|
paca_size = new_size;
|
|
|
|
free_lppacas();
|
|
}
|