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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: Wed, 14 Apr 2021 20:10:23 +1000
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Subject: [PATCH] ieee1275: drop HEAP_MAX_ADDR, HEAP_MIN_SIZE
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HEAP_MAX_ADDR is confusing. Currently it is set to 32MB, except
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on ieee1275 on x86, where it is 64MB.
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There is a comment which purports to explain it:
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/* If possible, we will avoid claiming heap above this address, because it
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seems to cause relocation problems with OSes that link at 4 MiB */
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This doesn't make a lot of sense when the constants are well above 4MB
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already. It was not always this way. Prior to
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commit 7b5d0fe4440c ("Increase heap limit") in 2010, HEAP_MAX_SIZE and
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HEAP_MAX_ADDR were indeed 4MB. However, when the constants were increased
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the comment was left unchanged.
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It's been over a decade. It doesn't seem like we have problems with
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claims over 4MB on powerpc or x86 ieee1275. (sparc does things completely
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differently and never used the constant.)
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Drop the constant and the check.
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The only use of HEAP_MIN_SIZE was to potentially override the
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HEAP_MAX_ADDR check. It is now unused. Remove it.
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Signed-off-by: Daniel Axtens <dja@axtens.net>
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---
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grub-core/kern/ieee1275/init.c | 17 -----------------
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1 file changed, 17 deletions(-)
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diff --git a/grub-core/kern/ieee1275/init.c b/grub-core/kern/ieee1275/init.c
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index fc7d971272..0dcd114ce5 100644
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--- a/grub-core/kern/ieee1275/init.c
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+++ b/grub-core/kern/ieee1275/init.c
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@@ -46,9 +46,6 @@
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#endif
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#include <grub/lockdown.h>
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-/* The minimal heap size we can live with. */
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-#define HEAP_MIN_SIZE (unsigned long) (2 * 1024 * 1024)
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-
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/* The maximum heap size we're going to claim */
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#ifdef __i386__
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#define HEAP_MAX_SIZE (unsigned long) (64 * 1024 * 1024)
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@@ -56,14 +53,6 @@
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#define HEAP_MAX_SIZE (unsigned long) (32 * 1024 * 1024)
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#endif
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-/* If possible, we will avoid claiming heap above this address, because it
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- seems to cause relocation problems with OSes that link at 4 MiB */
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-#ifdef __i386__
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-#define HEAP_MAX_ADDR (unsigned long) (64 * 1024 * 1024)
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-#else
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-#define HEAP_MAX_ADDR (unsigned long) (32 * 1024 * 1024)
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-#endif
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-
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extern char _end[];
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#ifdef __sparc__
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@@ -185,12 +174,6 @@ heap_init (grub_uint64_t addr, grub_uint64_t len, grub_memory_type_t type,
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if (*total + len > HEAP_MAX_SIZE)
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len = HEAP_MAX_SIZE - *total;
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- /* Avoid claiming anything above HEAP_MAX_ADDR, if possible. */
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- if ((addr < HEAP_MAX_ADDR) && /* if it's too late, don't bother */
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- (addr + len > HEAP_MAX_ADDR) && /* if it wasn't available anyway, don't bother */
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- (*total + (HEAP_MAX_ADDR - addr) > HEAP_MIN_SIZE)) /* only limit ourselves when we can afford to */
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- len = HEAP_MAX_ADDR - addr;
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-
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/* In theory, firmware should already prevent this from happening by not
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listing our own image in /memory/available. The check below is intended
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as a safeguard in case that doesn't happen. However, it doesn't protect
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