Generalize ARM specific comments in devmap
The comments in devmap are very ARM specific, this generalizes them for other architectures. Submitted by: Nicholas O'Brien <nickisobrien_gmail.com> Reviewed by: manu, philip Sponsored by: Axiado Differential Revision: https://reviews.freebsd.org/D22035
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2020-12-20 02:59:44 +00:00
svn path=/head/; revision=353600
@ -46,7 +46,7 @@ static boolean_t devmap_bootstrap_done = false;
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* The allocated-kva (akva) devmap table and metadata. Platforms can call
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* devmap_add_entry() to add static device mappings to this table using
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* automatically allocated virtual addresses carved out of the top of kva space.
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* Allocation begins immediately below the ARM_VECTORS_HIGH address.
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* Allocation begins immediately below the max kernel virtual address.
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*/
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#define AKVA_DEVMAP_MAX_ENTRIES 32
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static struct devmap_entry akva_devmap_entries[AKVA_DEVMAP_MAX_ENTRIES];
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@ -115,8 +115,8 @@ devmap_lastaddr()
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* physical address and size and a virtual address allocated from the top of
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* kva. This automatically registers the akva table on the first call, so all a
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* platform has to do is call this routine to install as many mappings as it
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* needs and when initarm() calls devmap_bootstrap() it will pick up all the
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* entries in the akva table automatically.
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* needs and when the platform-specific init function calls devmap_bootstrap()
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* it will pick up all the entries in the akva table automatically.
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*/
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void
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devmap_add_entry(vm_paddr_t pa, vm_size_t sz)
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@ -132,13 +132,13 @@ devmap_add_entry(vm_paddr_t pa, vm_size_t sz)
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if (akva_devmap_idx == 0)
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devmap_register_table(akva_devmap_entries);
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/*
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* Allocate virtual address space from the top of kva downwards. If the
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* range being mapped is aligned and sized to 1MB boundaries then also
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* align the virtual address to the next-lower 1MB boundary so that we
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* end up with a nice efficient section mapping.
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*/
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/* Allocate virtual address space from the top of kva downwards. */
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#ifdef __arm__
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/*
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* If the range being mapped is aligned and sized to 1MB boundaries then
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* also align the virtual address to the next-lower 1MB boundary so that
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* we end with a nice efficient section mapping.
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*/
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if ((pa & 0x000fffff) == 0 && (sz & 0x000fffff) == 0) {
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akva_devmap_vaddr = trunc_1mpage(akva_devmap_vaddr - sz);
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} else
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@ -170,7 +170,8 @@ devmap_register_table(const struct devmap_entry *table)
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* the previously-registered table is used. This smooths transition from legacy
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* code that fills in a local table then calls this function passing that table,
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* and newer code that uses devmap_register_table() in platform-specific
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* code, then lets the common initarm() call this function with a NULL pointer.
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* code, then lets the common platform-specific init function call this function
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* with a NULL pointer.
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*/
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void
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devmap_bootstrap(vm_offset_t l1pt, const struct devmap_entry *table)
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@ -63,16 +63,18 @@ void devmap_add_entry(vm_paddr_t pa, vm_size_t sz);
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/*
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* Register a platform-local table to be bootstrapped by the generic
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* initarm() in arm/machdep.c. This is used by newer code that allocates and
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* fills in its own local table but does not have its own initarm() routine.
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* platform-specific init function in <ARCH>/machdep.c. This is used by newer
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* code that allocates and fills in its own local table but does not have its
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* own platform-specific init routine.
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*/
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void devmap_register_table(const struct devmap_entry * _table);
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/*
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* Establish mappings for all the entries in the table. This is called
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* automatically from the common initarm() in arm/machdep.c, and also from the
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* custom initarm() routines in older code. If the table pointer is NULL, this
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* will use the table installed previously by devmap_register_table().
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* automatically from the common platform-specific init function in
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* <ARCH>/machdep.c, and also from the custom platform-specific init routines
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* in older code. If the table pointer is NULL, this will use the table
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* installed previously by devmap_register_table().
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*/
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void devmap_bootstrap(vm_offset_t _l1pt,
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const struct devmap_entry *_table);
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