[deliverable/linux.git] / arch / powerpc / kernel / paca.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/threads.h>
#include <linux/module.h>

#include <asm/lppaca.h>
#include <asm/paca.h>

/* This symbol is provided by the linker - let it fill in the paca
 * field correctly */
extern unsigned long __toc_start;

/*
 * 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 legacy iSeries and 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_CPUS-1)] = {
		.desc = 0xd397d781,	/* "LpPa" */
		.size = sizeof(struct lppaca),
		.dyn_proc_status = 2,
		.decr_val = 0x00ff0000,
		.fpregs_in_use = 1,
		.end_of_quantum = 0xfffffffffffffffful,
		.slb_count = 64,
		.vmxregs_in_use = 0,
	},
};

/*
 * 3 persistent SLBs are registered here.  The buffer will be zero
 * initially, hence will all be invaild until we actually write them.
 */
struct slb_shadow slb_shadow[] __cacheline_aligned = {
	[0 ... (NR_CPUS-1)] = {
		.persistent = SLB_NUM_BOLTED,
		.buffer_length = sizeof(struct slb_shadow),
	},
};

/* 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[NR_CPUS];
EXPORT_SYMBOL(paca);

void __init initialise_pacas(void)
{
	int cpu;

	/* The TOC register (GPR2) points 32kB into the TOC, so that 64kB
	 * of the TOC can be addressed using a single machine instruction.
	 */
	unsigned long kernel_toc = (unsigned long)(&__toc_start) + 0x8000UL;

	/* Can't use for_each_*_cpu, as they aren't functional yet */
	for (cpu = 0; cpu < NR_CPUS; cpu++) {
		struct paca_struct *new_paca = &paca[cpu];

		new_paca->lppaca_ptr = &lppaca[cpu];
		new_paca->lock_token = 0x8000;
		new_paca->paca_index = cpu;
		new_paca->kernel_toc = kernel_toc;
		new_paca->hw_cpu_id = 0xffff;
		new_paca->slb_shadow_ptr = &slb_shadow[cpu];
		new_paca->__current = &init_task;

	}
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* c 2001 PPC 64 Team, IBM Corp
	3	*
	4	* This program is free software; you can redistribute it and/or
	5	* modify it under the terms of the GNU General Public License
	6	* as published by the Free Software Foundation; either version
	7	* 2 of the License, or (at your option) any later version.
	8	*/
	9
1da177e4 LT	10	#include <linux/threads.h>
	11	#include <linux/module.h>
	12
1da177e4	13	#include <asm/lppaca.h>
1da177e4	14	#include <asm/paca.h>
1da177e4 LT	15
	16	/* This symbol is provided by the linker - let it fill in the paca
	17	* field correctly */
	18	extern unsigned long __toc_start;
	19
3356bb9f	20	/*
30ff2e87	21	* The structure which the hypervisor knows about - this structure
3356bb9f DG	22	* should not cross a page boundary. The vpa_init/register_vpa call
3356bb9f DG	23	* is now known to fail if the lppaca structure crosses a page
30ff2e87 SR	24	* boundary. The lppaca is also used on legacy iSeries and POWER5
	25	* pSeries boxes. The lppaca is 640 bytes long, and cannot readily
	26	* change since the hypervisor knows its layout, so a 1kB alignment
	27	* will suffice to ensure that it doesn't cross a page boundary.
3356bb9f DG	28	*/
	29	struct lppaca lppaca[] = {
	30	[0 ... (NR_CPUS-1)] = {
	31	.desc = 0xd397d781, /* "LpPa" */
	32	.size = sizeof(struct lppaca),
	33	.dyn_proc_status = 2,
	34	.decr_val = 0x00ff0000,
	35	.fpregs_in_use = 1,
	36	.end_of_quantum = 0xfffffffffffffffful,
	37	.slb_count = 64,
	38	.vmxregs_in_use = 0,
	39	},
	40	};
	41
2f6093c8 MN	42	/*
	43	* 3 persistent SLBs are registered here. The buffer will be zero
	44	* initially, hence will all be invaild until we actually write them.
	45	*/
	46	struct slb_shadow slb_shadow[] __cacheline_aligned = {
	47	[0 ... (NR_CPUS-1)] = {
	48	.persistent = SLB_NUM_BOLTED,
	49	.buffer_length = sizeof(struct slb_shadow),
	50	},
	51	};
	52
8882a4da	53	/* The Paca is an array with one entry per processor. Each contains an
1da177e4	54	* lppaca, which contains the information shared between the
1888e7b5	55	* hypervisor and Linux.
1da177e4 LT	56	* On systems with hardware multi-threading, there are two threads
	57	* per processor. The Paca array must contain an entry for each thread.
	58	* The VPD Areas will give a max logical processors = 2 * max physical
	59	* processors. The processor VPD array needs one entry per physical
	60	* processor (not thread).
	61	*/
90035fe3	62	struct paca_struct paca[NR_CPUS];
1da177e4	63	EXPORT_SYMBOL(paca);
90035fe3 TB	64
	65	void __init initialise_pacas(void)
	66	{
	67	int cpu;
	68
	69	/* The TOC register (GPR2) points 32kB into the TOC, so that 64kB
	70	* of the TOC can be addressed using a single machine instruction.
	71	*/
	72	unsigned long kernel_toc = (unsigned long)(&__toc_start) + 0x8000UL;
	73
	74	/* Can't use for_each__cpu, as they aren't functional yet /
	75	for (cpu = 0; cpu < NR_CPUS; cpu++) {
	76	struct paca_struct *new_paca = &paca[cpu];
	77
	78	new_paca->lppaca_ptr = &lppaca[cpu];
	79	new_paca->lock_token = 0x8000;
	80	new_paca->paca_index = cpu;
	81	new_paca->kernel_toc = kernel_toc;
	82	new_paca->hw_cpu_id = 0xffff;
	83	new_paca->slb_shadow_ptr = &slb_shadow[cpu];
	84	new_paca->__current = &init_task;
	85
	86	}
	87	}