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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Peter Jones <pjones@redhat.com>
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Date: Fri, 12 Jul 2019 09:53:32 +0200
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Subject: [PATCH] x86-efi: Use bounce buffers for reading to addresses > 4GB
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Lots of machines apparently can't DMA correctly above 4GB during UEFI,
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so use bounce buffers for the initramfs read.
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Signed-off-by: Peter Jones <pjones@redhat.com>
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---
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grub-core/loader/i386/efi/linux.c | 52 +++++++++++++++++++++++++++++++++------
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1 file changed, 45 insertions(+), 7 deletions(-)
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diff --git a/grub-core/loader/i386/efi/linux.c b/grub-core/loader/i386/efi/linux.c
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index 33e981e76e7..2f0336809e7 100644
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--- a/grub-core/loader/i386/efi/linux.c
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+++ b/grub-core/loader/i386/efi/linux.c
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@@ -35,11 +35,16 @@ static grub_dl_t my_mod;
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static int loaded;
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static void *kernel_mem;
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static grub_uint64_t kernel_size;
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-static grub_uint8_t *initrd_mem;
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+static void *initrd_mem;
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static grub_uint32_t handover_offset;
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struct linux_kernel_params *params;
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static char *linux_cmdline;
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+#define MIN(a, b) \
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+ ({ typeof (a) _a = (a); \
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+ typeof (b) _b = (b); \
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+ _a < _b ? _a : _b; })
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+
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#define BYTES_TO_PAGES(bytes) (((bytes) + 0xfff) >> 12)
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static grub_err_t
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@@ -73,6 +78,44 @@ grub_linuxefi_unload (void)
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return GRUB_ERR_NONE;
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}
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+#define BOUNCE_BUFFER_MAX 0x10000000ull
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+
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+static grub_ssize_t
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+read(grub_file_t file, grub_uint8_t *bufp, grub_size_t len)
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+{
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+ grub_ssize_t bufpos = 0;
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+ static grub_size_t bbufsz = 0;
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+ static char *bbuf = NULL;
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+
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+ if (bbufsz == 0)
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+ bbufsz = MIN(BOUNCE_BUFFER_MAX, len);
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+
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+ while (!bbuf && bbufsz)
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+ {
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+ bbuf = grub_malloc(bbufsz);
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+ if (!bbuf)
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+ bbufsz >>= 1;
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+ }
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+ if (!bbuf)
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+ grub_error (GRUB_ERR_OUT_OF_MEMORY, N_("cannot allocate bounce buffer"));
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+
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+ while (bufpos < (long long)len)
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+ {
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+ grub_ssize_t sz;
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+
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+ sz = grub_file_read (file, bbuf, MIN(bbufsz, len - bufpos));
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+ if (sz < 0)
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+ return sz;
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+ if (sz == 0)
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+ break;
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+
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+ grub_memcpy(bufp + bufpos, bbuf, sz);
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+ bufpos += sz;
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+ }
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+
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+ return bufpos;
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+}
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+
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static grub_err_t
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grub_cmd_initrd (grub_command_t cmd __attribute__ ((unused)),
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int argc, char *argv[])
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@@ -126,7 +169,7 @@ grub_cmd_initrd (grub_command_t cmd __attribute__ ((unused)),
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for (i = 0; i < nfiles; i++)
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{
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grub_ssize_t cursize = grub_file_size (files[i]);
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- if (grub_file_read (files[i], ptr, cursize) != cursize)
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+ if (read (files[i], ptr, cursize) != cursize)
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{
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if (!grub_errno)
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grub_error (GRUB_ERR_FILE_READ_ERROR, N_("premature end of file %s"),
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@@ -152,11 +195,6 @@ grub_cmd_initrd (grub_command_t cmd __attribute__ ((unused)),
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return grub_errno;
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}
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-#define MIN(a, b) \
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- ({ typeof (a) _a = (a); \
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- typeof (b) _b = (b); \
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- _a < _b ? _a : _b; })
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-
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static grub_err_t
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grub_cmd_linux (grub_command_t cmd __attribute__ ((unused)),
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int argc, char *argv[])
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