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base: add 'aligned' function to util/misc_math.h

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This function simplifies the sanity checking of values that are expected
to be aligned, e.g., data offsets within packet streams.
This commit is contained in:
Norman Feske 2019-04-05 09:05:35 +02:00 committed by Christian Helmuth
parent 6ea1179145
commit 10c567daee
2 changed files with 8 additions and 13 deletions
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6
repos/base/include/util/misc_math.h
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@ -26,7 +26,7 @@ namespace Genode {
static constexpr T abs(T value) { return value >= 0 ? value : -value; }
/**
/*
* Alignment to the power of two
*/
template <typename T>
@ -41,6 +41,10 @@ namespace Genode {
static constexpr T align_addr(T addr, int align) {
return (addr + _align_offset((T)align)) & _align_mask((T)align); }
template <typename T>
static constexpr bool aligned(T value, unsigned align_log2) {
return (_align_offset(align_log2) & value) == 0; }
/**
* LOG2

15
repos/os/src/drivers/gpu/intel/ppgtt.h
View File

@ -39,15 +39,6 @@ namespace Genode
inline addr_t trunc(addr_t const addr, addr_t const alignm_log2) {
return (addr >> alignm_log2) << alignm_log2; }
/**
* Return wether a pointer fullfills an alignment
*
* \param p pointer
* \param alignm_log2 log2 of the required alignment
*/
inline bool aligned(void * const p, addr_t const alignm_log2) {
return (addr_t)p == trunc((addr_t)p, alignm_log2); }
/**
* Translation table allocator interface
*/
@ -344,7 +335,7 @@ class Genode::Level_4_translation_table
*/
Level_4_translation_table(Scratch::Page *scratch)
{
if (!aligned(this, ALIGNM_LOG2)) { throw Misaligned(); }
if (!aligned((addr_t)this, ALIGNM_LOG2)) { throw Misaligned(); }
for (size_t i = 0; i < MAX_ENTRIES; i++) {
_entries[i] = scratch->addr;
@ -592,7 +583,7 @@ class Genode::Page_directory
Page_directory(Scratch::Page *scratch)
{
if (!aligned(this, ALIGNM_LOG2)) { throw Misaligned(); }
if (!aligned((addr_t)this, ALIGNM_LOG2)) { throw Misaligned(); }
for (size_t i = 0; i < MAX_ENTRIES; i++) {
_entries[i] = scratch->addr;
@ -778,7 +769,7 @@ class Genode::Pml4_table
Pml4_table(Scratch::Page *scratch)
{
if (!aligned(this, ALIGNM_LOG2)) { throw Misaligned(); }
if (!aligned((addr_t)this, ALIGNM_LOG2)) { throw Misaligned(); }
for (size_t i = 0; i < MAX_ENTRIES; i++) {
_entries[i] = scratch->addr;