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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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b9377ffc3a
Our pseries hcall interfaces are out of control: plpar_hcall_norets plpar_hcall plpar_hcall_8arg_2ret plpar_hcall_4out plpar_hcall_7arg_7ret plpar_hcall_9arg_9ret Create 3 interfaces to cover all cases: plpar_hcall_norets: 7 arguments no returns plpar_hcall: 6 arguments 4 returns plpar_hcall9: 9 arguments 9 returns There are only 2 cases in the kernel that need plpar_hcall9, hopefully we can keep it that way. Pass in a buffer to stash return parameters so we avoid the &dummy1, &dummy2 madness. Signed-off-by: Anton Blanchard <anton@samba.org> -- Signed-off-by: Paul Mackerras <paulus@samba.org>
81 lines
2.3 KiB
C
81 lines
2.3 KiB
C
/*
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* hvconsole.c
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* Copyright (C) 2004 Hollis Blanchard, IBM Corporation
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* Copyright (C) 2004 IBM Corporation
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*
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* Additional Author(s):
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* Ryan S. Arnold <rsa@us.ibm.com>
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*
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* LPAR console support.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <asm/hvcall.h>
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#include <asm/hvconsole.h>
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#include "plpar_wrappers.h"
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/**
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* hvc_get_chars - retrieve characters from firmware for denoted vterm adatper
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* @vtermno: The vtermno or unit_address of the adapter from which to fetch the
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* data.
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* @buf: The character buffer into which to put the character data fetched from
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* firmware.
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* @count: not used?
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*/
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int hvc_get_chars(uint32_t vtermno, char *buf, int count)
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{
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unsigned long got;
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if (plpar_get_term_char(vtermno, &got, buf) == H_SUCCESS)
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return got;
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return 0;
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}
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EXPORT_SYMBOL(hvc_get_chars);
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/**
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* hvc_put_chars: send characters to firmware for denoted vterm adapter
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* @vtermno: The vtermno or unit_address of the adapter from which the data
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* originated.
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* @buf: The character buffer that contains the character data to send to
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* firmware.
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* @count: Send this number of characters.
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*/
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int hvc_put_chars(uint32_t vtermno, const char *buf, int count)
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{
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unsigned long *lbuf = (unsigned long *) buf;
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long ret;
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/* hcall will ret H_PARAMETER if 'count' exceeds firmware max.*/
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if (count > MAX_VIO_PUT_CHARS)
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count = MAX_VIO_PUT_CHARS;
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ret = plpar_hcall_norets(H_PUT_TERM_CHAR, vtermno, count, lbuf[0],
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lbuf[1]);
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if (ret == H_SUCCESS)
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return count;
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if (ret == H_BUSY)
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return 0;
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return -EIO;
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}
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EXPORT_SYMBOL(hvc_put_chars);
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