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63 lines
1.3 KiB
63 lines
1.3 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* bootstr.c: Boot string/argument acquisition from the PROM. |
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* |
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* Copyright(C) 1995 David S. Miller ([email protected]) |
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*/ |
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#include <linux/string.h> |
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#include <asm/oplib.h> |
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#include <linux/init.h> |
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#define BARG_LEN 256 |
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static char barg_buf[BARG_LEN] = { 0 }; |
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static char fetched __initdata = 0; |
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char * __init |
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prom_getbootargs(void) |
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{ |
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int iter; |
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char *cp, *arg; |
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/* This check saves us from a panic when bootfd patches args. */ |
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if (fetched) { |
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return barg_buf; |
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} |
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switch (prom_vers) { |
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case PROM_V0: |
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cp = barg_buf; |
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/* Start from 1 and go over fd(0,0,0)kernel */ |
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for (iter = 1; iter < 8; iter++) { |
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arg = (*(romvec->pv_v0bootargs))->argv[iter]; |
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if (arg == NULL) |
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break; |
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while (*arg != 0) { |
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/* Leave place for space and null. */ |
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if (cp >= barg_buf + BARG_LEN - 2) |
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/* We might issue a warning here. */ |
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break; |
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*cp++ = *arg++; |
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} |
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*cp++ = ' '; |
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if (cp >= barg_buf + BARG_LEN - 1) |
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/* We might issue a warning here. */ |
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break; |
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} |
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*cp = 0; |
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break; |
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case PROM_V2: |
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case PROM_V3: |
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/* |
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* V3 PROM cannot supply as with more than 128 bytes |
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* of an argument. But a smart bootstrap loader can. |
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*/ |
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strlcpy(barg_buf, *romvec->pv_v2bootargs.bootargs, sizeof(barg_buf)); |
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break; |
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default: |
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break; |
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} |
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fetched = 1; |
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return barg_buf; |
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}
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