[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [PATCH 2/5] arm/mpu: Implement setup_mm for MPU systems
From: Luca Fancellu <luca.fancellu@xxxxxxx> Implement `setup_mm` for MPU systems. This variant doesn't need to set up the direct map. Signed-off-by: Luca Fancellu <luca.fancellu@xxxxxxx> Signed-off-by: Hari Limaye <hari.limaye@xxxxxxx> --- xen/arch/arm/mpu/mm.c | 64 ++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 63 insertions(+), 1 deletion(-) diff --git a/xen/arch/arm/mpu/mm.c b/xen/arch/arm/mpu/mm.c index 6a16fa348d..0b05103180 100644 --- a/xen/arch/arm/mpu/mm.c +++ b/xen/arch/arm/mpu/mm.c @@ -8,9 +8,12 @@ #include <xen/sizes.h> #include <xen/spinlock.h> #include <xen/types.h> +#include <xen/static-memory.h> +#include <xen/static-shmem.h> #include <asm/mpu.h> #include <asm/mpu/mm.h> #include <asm/page.h> +#include <asm/setup.h> #include <asm/sysregs.h> struct page_info *frame_table; @@ -364,9 +367,68 @@ int map_pages_to_xen(unsigned long virt, mfn_t mfn, unsigned long nr_mfns, return xen_mpumap_update(virt, mfn_to_maddr(mfn_add(mfn, nr_mfns)), flags); } +/* + * Heap must be statically configured in Device Tree through "xen,static-heap" + * on MPU systems. + */ +static void __init setup_staticheap_mappings(void) +{ + const struct membanks *reserved_mem = bootinfo_get_reserved_mem(); + unsigned int bank = 0; + + for ( ; bank < reserved_mem->nr_banks; bank++ ) + { + if ( reserved_mem->bank[bank].type == MEMBANK_STATIC_HEAP ) + { + paddr_t bank_start = round_pgup(reserved_mem->bank[bank].start); + paddr_t bank_size = round_pgdown(reserved_mem->bank[bank].size); + paddr_t bank_end = bank_start + bank_size; + + /* Map static heap with one MPU protection region */ + if ( xen_mpumap_update(bank_start, bank_end, PAGE_HYPERVISOR) ) + panic("Failed to map static heap\n"); + + break; + } + } + + if ( bank == reserved_mem->nr_banks ) + panic("No static heap memory bank found\n"); +} + void __init setup_mm(void) { - BUG_ON("unimplemented"); + const struct membanks *mem = bootinfo_get_mem(); + paddr_t ram_start = INVALID_PADDR, ram_end = 0, ram_size = 0; + + if ( !mem->nr_banks ) + panic("No memory bank\n"); + + init_pdx(); + + populate_boot_allocator(); + + total_pages = 0; + for ( unsigned int bank = 0 ; bank < mem->nr_banks; bank++ ) + { + paddr_t bank_start = round_pgup(mem->bank[bank].start); + paddr_t bank_size = round_pgdown(mem->bank[bank].size); + paddr_t bank_end = bank_start + bank_size; + + ram_size = ram_size + bank_size; + ram_start = min(ram_start, bank_start); + ram_end = max(ram_end, bank_end); + } + + setup_staticheap_mappings(); + + total_pages += ram_size >> PAGE_SHIFT; + max_page = PFN_DOWN(ram_end); + + setup_frametable_mappings(ram_start, ram_end); + + init_staticmem_pages(); + init_sharedmem_pages(); } int modify_xen_mappings(unsigned long s, unsigned long e, unsigned int nf) -- 2.34.1
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