303 lines
7.5 KiB
C
303 lines
7.5 KiB
C
/* pxe.c - Driver to provide access to the pxe filesystem */
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/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2008,2009,2011 Free Software Foundation, Inc.
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*
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* GRUB 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 3 of the License, or
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* (at your option) any later version.
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*
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* GRUB 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 GRUB. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <grub/dl.h>
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#include <grub/net.h>
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#include <grub/mm.h>
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#include <grub/file.h>
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#include <grub/misc.h>
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#include <grub/bufio.h>
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#include <grub/env.h>
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#include <grub/machine/pxe.h>
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#include <grub/machine/int.h>
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#include <grub/machine/memory.h>
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GRUB_MOD_LICENSE ("GPLv3+");
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#define SEGMENT(x) ((x) >> 4)
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#define OFFSET(x) ((x) & 0xF)
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#define SEGOFS(x) ((SEGMENT(x) << 16) + OFFSET(x))
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#define LINEAR(x) (void *) ((((x) >> 16) << 4) + ((x) & 0xFFFF))
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struct grub_pxe_undi_open
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{
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grub_uint16_t status;
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grub_uint16_t open_flag;
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grub_uint16_t pkt_filter;
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grub_uint16_t mcast_count;
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grub_uint8_t mcast[8][6];
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} __attribute__ ((packed));
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struct grub_pxe_undi_isr
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{
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grub_uint16_t status;
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grub_uint16_t func_flag;
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grub_uint16_t buffer_len;
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grub_uint16_t frame_len;
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grub_uint16_t frame_hdr_len;
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grub_uint32_t buffer;
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grub_uint8_t prot_type;
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grub_uint8_t pkt_type;
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} __attribute__ ((packed));
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enum
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{
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GRUB_PXE_ISR_IN_START = 1,
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GRUB_PXE_ISR_IN_PROCESS,
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GRUB_PXE_ISR_IN_GET_NEXT
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};
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enum
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{
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GRUB_PXE_ISR_OUT_OURS = 0,
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GRUB_PXE_ISR_OUT_NOT_OURS = 1
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};
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enum
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{
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GRUB_PXE_ISR_OUT_DONE = 0,
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GRUB_PXE_ISR_OUT_TRANSMIT = 2,
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GRUB_PXE_ISR_OUT_RECEIVE = 3,
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GRUB_PXE_ISR_OUT_BUSY = 4,
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};
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struct grub_pxe_undi_transmit
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{
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grub_uint16_t status;
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grub_uint8_t protocol;
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grub_uint8_t xmitflag;
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grub_uint32_t dest;
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grub_uint32_t tbd;
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grub_uint32_t reserved[2];
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} __attribute__ ((packed));
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struct grub_pxe_undi_tbd
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{
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grub_uint16_t len;
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grub_uint32_t buf;
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grub_uint16_t blk_count;
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struct
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{
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grub_uint8_t ptr_type;
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grub_uint8_t reserved;
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grub_uint16_t len;
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grub_uint32_t ptr;
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} blocks[8];
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} __attribute__ ((packed));
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struct grub_pxe_bangpxe *grub_pxe_pxenv;
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static grub_uint32_t pxe_rm_entry = 0;
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static struct grub_pxe_bangpxe *
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grub_pxe_scan (void)
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{
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struct grub_bios_int_registers regs;
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struct grub_pxenv *pxenv;
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struct grub_pxe_bangpxe *bangpxe;
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regs.flags = GRUB_CPU_INT_FLAGS_DEFAULT;
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regs.ebx = 0;
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regs.ecx = 0;
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regs.eax = 0x5650;
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regs.es = 0;
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grub_bios_interrupt (0x1a, ®s);
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if ((regs.eax & 0xffff) != 0x564e)
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return NULL;
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pxenv = (struct grub_pxenv *) ((regs.es << 4) + (regs.ebx & 0xffff));
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if (grub_memcmp (pxenv->signature, GRUB_PXE_SIGNATURE,
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sizeof (pxenv->signature))
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!= 0)
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return NULL;
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if (pxenv->version < 0x201)
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return NULL;
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bangpxe = (void *) ((((pxenv->pxe_ptr & 0xffff0000) >> 16) << 4)
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+ (pxenv->pxe_ptr & 0xffff));
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if (!bangpxe)
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return NULL;
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if (grub_memcmp (bangpxe->signature, GRUB_PXE_BANGPXE_SIGNATURE,
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sizeof (bangpxe->signature)) != 0)
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return NULL;
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pxe_rm_entry = bangpxe->rm_entry;
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return bangpxe;
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}
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static grub_ssize_t
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grub_pxe_recv (const struct grub_net_card *dev __attribute__ ((unused)),
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struct grub_net_buff *buf)
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{
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struct grub_pxe_undi_isr *isr;
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static int in_progress = 0;
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char *ptr, *end;
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int len;
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isr = (void *) GRUB_MEMORY_MACHINE_SCRATCH_ADDR;
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if (!in_progress)
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{
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grub_memset (isr, 0, sizeof (*isr));
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isr->func_flag = GRUB_PXE_ISR_IN_START;
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grub_pxe_call (GRUB_PXENV_UNDI_ISR, isr, pxe_rm_entry);
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if (isr->status || isr->func_flag != GRUB_PXE_ISR_OUT_OURS)
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return -1;
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grub_memset (isr, 0, sizeof (*isr));
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isr->func_flag = GRUB_PXE_ISR_IN_PROCESS;
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grub_pxe_call (GRUB_PXENV_UNDI_ISR, isr, pxe_rm_entry);
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}
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else
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{
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grub_memset (isr, 0, sizeof (*isr));
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isr->func_flag = GRUB_PXE_ISR_IN_GET_NEXT;
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grub_pxe_call (GRUB_PXENV_UNDI_ISR, isr, pxe_rm_entry);
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}
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while (isr->func_flag != GRUB_PXE_ISR_OUT_RECEIVE)
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{
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if (isr->status || isr->func_flag == GRUB_PXE_ISR_OUT_DONE)
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return -1;
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grub_memset (isr, 0, sizeof (*isr));
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isr->func_flag = GRUB_PXE_ISR_IN_GET_NEXT;
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grub_pxe_call (GRUB_PXENV_UNDI_ISR, isr, pxe_rm_entry);
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}
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grub_netbuff_put (buf, isr->frame_len);
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ptr = buf->data;
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end = ptr + isr->frame_len;
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len = isr->frame_len;
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grub_memcpy (ptr, LINEAR (isr->buffer), isr->buffer_len);
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ptr += isr->buffer_len;
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while (ptr < end)
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{
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grub_memset (isr, 0, sizeof (*isr));
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isr->func_flag = GRUB_PXE_ISR_IN_GET_NEXT;
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grub_pxe_call (GRUB_PXENV_UNDI_ISR, isr, pxe_rm_entry);
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if (isr->status || isr->func_flag != GRUB_PXE_ISR_OUT_RECEIVE)
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return -1;
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grub_memcpy (ptr, LINEAR (isr->buffer), isr->buffer_len);
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ptr += isr->buffer_len;
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}
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return len;
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}
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static grub_err_t
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grub_pxe_send (const struct grub_net_card *dev __attribute__ ((unused)),
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struct grub_net_buff *pack)
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{
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struct grub_pxe_undi_transmit *trans;
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struct grub_pxe_undi_tbd *tbd;
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char *buf;
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trans = (void *) GRUB_MEMORY_MACHINE_SCRATCH_ADDR;
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grub_memset (trans, 0, sizeof (*trans));
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tbd = (void *) (GRUB_MEMORY_MACHINE_SCRATCH_ADDR + 128);
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grub_memset (tbd, 0, sizeof (*tbd));
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buf = (void *) (GRUB_MEMORY_MACHINE_SCRATCH_ADDR + 256);
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grub_memcpy (buf, pack->data, pack->tail - pack->data);
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trans->tbd = SEGOFS ((grub_addr_t) tbd);
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trans->protocol = 0;
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tbd->len = pack->tail - pack->data;
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tbd->buf = SEGOFS ((grub_addr_t) buf);
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grub_pxe_call (GRUB_PXENV_UNDI_TRANSMIT, trans, pxe_rm_entry);
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if (trans->status)
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return grub_error (GRUB_ERR_IO, "PXE send failed (status 0x%x)",
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trans->status);
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return 0;
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}
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struct grub_net_card_driver grub_pxe_card_driver =
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{
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.send = grub_pxe_send,
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.recv = grub_pxe_recv
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};
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struct grub_net_card grub_pxe_card =
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{
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.driver = &grub_pxe_card_driver,
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.name = "pxe"
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};
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void
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grub_pxe_unload (void)
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{
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if (grub_pxe_pxenv)
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{
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grub_pxe_call (GRUB_PXENV_UNDI_CLOSE,
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(void *) GRUB_MEMORY_MACHINE_SCRATCH_ADDR,
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pxe_rm_entry);
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grub_net_card_unregister (&grub_pxe_card);
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grub_pxe_pxenv = 0;
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}
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}
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GRUB_MOD_INIT(pxe)
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{
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struct grub_pxe_bangpxe *pxenv;
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struct grub_pxenv_get_cached_info ci;
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struct grub_net_bootp_packet *bp;
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struct grub_pxe_undi_open *ou;
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pxenv = grub_pxe_scan ();
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if (! pxenv)
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return;
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ci.packet_type = GRUB_PXENV_PACKET_TYPE_DHCP_ACK;
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ci.buffer = 0;
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ci.buffer_size = 0;
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grub_pxe_call (GRUB_PXENV_GET_CACHED_INFO, &ci, pxe_rm_entry);
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if (ci.status)
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return;
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bp = LINEAR (ci.buffer);
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grub_memcpy (grub_pxe_card.default_address.mac, bp->mac_addr,
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bp->hw_len < sizeof (grub_pxe_card.default_address.mac)
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? bp->hw_len : sizeof (grub_pxe_card.default_address.mac));
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grub_pxe_card.default_address.type = GRUB_NET_LINK_LEVEL_PROTOCOL_ETHERNET;
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ou = (void *) GRUB_MEMORY_MACHINE_SCRATCH_ADDR;
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grub_memset (ou, 0, sizeof (*ou));
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ou->pkt_filter = 4;
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grub_pxe_call (GRUB_PXENV_UNDI_OPEN, ou, pxe_rm_entry);
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if (ou->status)
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return;
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grub_net_card_register (&grub_pxe_card);
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grub_net_configure_by_dhcp_ack ("pxe", &grub_pxe_card, 0,
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bp, GRUB_PXE_BOOTP_SIZE);
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}
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GRUB_MOD_FINI(pxe)
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{
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grub_pxe_unload ();
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}
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