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75 lines
1.9 KiB
75 lines
1.9 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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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 <[email protected]> |
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* |
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* LPAR console support. |
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*/ |
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#include <linux/kernel.h> |
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#include <linux/export.h> |
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#include <linux/errno.h> |
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#include <asm/hvcall.h> |
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#include <asm/hvconsole.h> |
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#include <asm/plpar_wrappers.h> |
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/** |
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* hvc_get_chars - retrieve characters from firmware for denoted vterm adapter |
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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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long ret; |
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unsigned long retbuf[PLPAR_HCALL_BUFSIZE]; |
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unsigned long *lbuf = (unsigned long *)buf; |
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ret = plpar_hcall(H_GET_TERM_CHAR, retbuf, vtermno); |
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lbuf[0] = be64_to_cpu(retbuf[1]); |
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lbuf[1] = be64_to_cpu(retbuf[2]); |
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if (ret == H_SUCCESS) |
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return retbuf[0]; |
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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. Must be at least 16 bytes, even if count is less than 16. |
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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, |
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cpu_to_be64(lbuf[0]), |
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cpu_to_be64(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 -EAGAIN; |
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return -EIO; |
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} |
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EXPORT_SYMBOL(hvc_put_chars);
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