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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Daniel Axtens <dja@axtens.net>
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Date: Thu, 21 Apr 2022 15:24:16 +1000
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Subject: [PATCH] mm: Debug support for region operations
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This is handy for debugging. Enable with "set debug=regions".
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Signed-off-by: Daniel Axtens <dja@axtens.net>
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Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
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Tested-by: Patrick Steinhardt <ps@pks.im>
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(cherry picked from commit 8afa5ef45b797ba5d8147ceee85ac2c59dcc7f09)
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---
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grub-core/kern/mm.c | 19 ++++++++++++++++---
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1 file changed, 16 insertions(+), 3 deletions(-)
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diff --git a/grub-core/kern/mm.c b/grub-core/kern/mm.c
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index 7be33e23bf..38bfb01df9 100644
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--- a/grub-core/kern/mm.c
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+++ b/grub-core/kern/mm.c
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@@ -115,9 +115,8 @@ grub_mm_init_region (void *addr, grub_size_t size)
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grub_mm_header_t h;
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grub_mm_region_t r, *p, q;
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-#if 0
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- grub_printf ("Using memory for heap: start=%p, end=%p\n", addr, addr + (unsigned int) size);
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-#endif
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+ grub_dprintf ("regions", "Using memory for heap: start=%p, end=%p\n",
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+ addr, (char *) addr + (unsigned int) size);
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/* Exclude last 4K to avoid overflows. */
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/* If addr + 0x1000 overflows then whole region is in excluded zone. */
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@@ -142,8 +141,14 @@ grub_mm_init_region (void *addr, grub_size_t size)
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* addr q
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* |----size-----|-q->pre_size-|<q region>|
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*/
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+ grub_dprintf ("regions", "Can we extend into region above?"
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+ " %p + %" PRIxGRUB_SIZE " + %" PRIxGRUB_SIZE " ?=? %p\n",
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+ (grub_uint8_t *) addr, size, q->pre_size, (grub_uint8_t *) q);
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if ((grub_uint8_t *) addr + size + q->pre_size == (grub_uint8_t *) q)
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{
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+ grub_dprintf ("regions", "Yes: extending a region: (%p -> %p) -> (%p -> %p)\n",
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+ q, (grub_uint8_t *) q + sizeof (*q) + q->size,
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+ addr, (grub_uint8_t *) q + sizeof (*q) + q->size);
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/*
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* Yes, we can merge the memory starting at addr into the
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* existing region from below. Align up addr to GRUB_MM_ALIGN
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@@ -185,9 +190,15 @@ grub_mm_init_region (void *addr, grub_size_t size)
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* q addr
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* |<q region>|-q->post_size-|----size-----|
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*/
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+ grub_dprintf ("regions", "Can we extend into region below?"
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+ " %p + %" PRIxGRUB_SIZE " + %" PRIxGRUB_SIZE " + %" PRIxGRUB_SIZE " ?=? %p\n",
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+ (grub_uint8_t *) q, sizeof(*q), q->size, q->post_size, (grub_uint8_t *) addr);
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if ((grub_uint8_t *) q + sizeof (*q) + q->size + q->post_size ==
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(grub_uint8_t *) addr)
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{
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+ grub_dprintf ("regions", "Yes: extending a region: (%p -> %p) -> (%p -> %p)\n",
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+ q, (grub_uint8_t *) q + sizeof (*q) + q->size,
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+ q, (grub_uint8_t *) addr + size);
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/*
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* Yes! Follow a similar pattern to above, but simpler.
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* Our header starts at address - post_size, which should align us
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@@ -213,6 +224,8 @@ grub_mm_init_region (void *addr, grub_size_t size)
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}
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}
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+ grub_dprintf ("regions", "No: considering a new region at %p of size %" PRIxGRUB_SIZE "\n",
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+ addr, size);
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/* Allocate a region from the head. */
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r = (grub_mm_region_t) ALIGN_UP ((grub_addr_t) addr, GRUB_MM_ALIGN);
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