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Adda function to iterate over the cpu nodes in the OFW or FDT data. This

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will be used with arm64 to find which cpus to enable, and could also be
used with 32-bit arm and mips for the same purpose.

Differential Revision:	https://reviews.freebsd.org/D1825
Sponsored by:	The FreeBSD Foundation
This commit is contained in:
andrew 2015-02-19 16:34:48 +00:00
parent 3422f5929d
commit d2e0481e04
2 changed files with 86 additions and 0 deletions
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48
sys/dev/ofw/ofw_cpu.c
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@ -43,6 +43,7 @@ __FBSDID("$FreeBSD$");
#include <dev/ofw/openfirm.h>
#include <dev/ofw/ofw_bus.h>
#include <dev/ofw/ofw_bus_subr.h>
#include <dev/ofw/ofw_cpu.h>
static int ofw_cpulist_probe(device_t);
static int ofw_cpulist_attach(device_t);
@ -274,3 +275,50 @@ ofw_cpu_read_ivar(device_t dev, device_t child, int index, uintptr_t *result)
return (ENOENT);
}
int
ofw_cpu_early_foreach(ofw_cpu_foreach_cb callback, boolean_t only_runnable)
{
phandle_t node, child;
pcell_t addr_cells, reg[2];
char status[16];
u_int id;
int count, rv;
count = 0;
id = 0;
node = OF_finddevice("/cpus");
if (node == -1)
return (-1);
/* Find the number of cells in the cpu register */
if (OF_getencprop(node, "#address-cells", &addr_cells,
sizeof(addr_cells)) < 0)
return (-1);
for (child = OF_child(node); child != 0; child = OF_peer(child), id++) {
/*
* If we are filtering by runnable then limit to only
* those that have been enabled.
*/
if (only_runnable) {
status[0] = '\0';
OF_getprop(child, "status", status, sizeof(status));
if (status[0] != '\0' && strcmp(status, "okay") != 0)
continue;
}
/*
* Check we have a register to identify the cpu
*/
rv = OF_getencprop(child, "reg", reg,
addr_cells * sizeof(cell_t));
if (rv != addr_cells * sizeof(cell_t))
continue;
if (callback == NULL || callback(id, child, addr_cells, reg))
count++;
}
return (only_runnable ? count : id);
}

38
sys/dev/ofw/ofw_cpu.h Normal file
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@ -0,0 +1,38 @@
/*-
* Copyright (c) 2015 The FreeBSD Foundation
* All rights reserved.
*
* This software was developed by Andrew Turner under
* sponsorship from the FreeBSD Foundation.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*/
#ifndef _DEV_OFW_OFW_CPU_H_
#define _DEV_OFW_OFW_CPU_H_
typedef boolean_t (*ofw_cpu_foreach_cb)(u_int, phandle_t, u_int, pcell_t *);
int ofw_cpu_early_foreach(ofw_cpu_foreach_cb, boolean_t);
#endif /* _DEV_OFW_OFW_CPU_H_ */