[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH v2 3/9] xen/arm: Reserve FDT via early module mechanism
This will stop us putting any heaps or relocating Xen itself over the FDT. The devicetree will be copied to allocated memory in setup_mm and the original copy will be freed by discard_initial_modules. Signed-off-by: Ian Campbell <ian.campbell@xxxxxxxxxx> --- xen/arch/arm/setup.c | 3 ++- xen/common/device_tree.c | 9 ++++++++- xen/include/xen/device_tree.h | 11 ++++++----- 3 files changed, 16 insertions(+), 7 deletions(-) diff --git a/xen/arch/arm/setup.c b/xen/arch/arm/setup.c index 1ba2eb3..ab3d9aa 100644 --- a/xen/arch/arm/setup.c +++ b/xen/arch/arm/setup.c @@ -510,9 +510,10 @@ void __init start_xen(unsigned long boot_phys_offset, smp_clear_cpu_maps(); + /* This is mapped by head.S */ device_tree_flattened = (void *)BOOT_MISC_VIRT_START + (fdt_paddr & ((1 << SECOND_SHIFT) - 1)); - fdt_size = device_tree_early_init(device_tree_flattened); + fdt_size = device_tree_early_init(device_tree_flattened, fdt_paddr); cpus = smp_get_max_cpus(); cmdline_parse(device_tree_bootargs(device_tree_flattened)); diff --git a/xen/common/device_tree.c b/xen/common/device_tree.c index c4f0f2c..9e0c224 100644 --- a/xen/common/device_tree.c +++ b/xen/common/device_tree.c @@ -510,14 +510,21 @@ static void __init early_print_info(void) * * Returns the size of the DTB. */ -size_t __init device_tree_early_init(const void *fdt) +size_t __init device_tree_early_init(const void *fdt, paddr_t paddr) { + struct dt_mb_module *mod; int ret; ret = fdt_check_header(fdt); if ( ret < 0 ) early_panic("No valid device tree\n"); + mod = &early_info.modules.module[MOD_FDT]; + mod->start = paddr & PAGE_MASK; + mod->size = (fdt_totalsize(fdt) + ~PAGE_MASK) & PAGE_MASK; + + early_info.modules.nr_mods = max(MOD_FDT, early_info.modules.nr_mods); + device_tree_for_each_node((void *)fdt, early_scan_node, NULL); early_print_info(); diff --git a/xen/include/xen/device_tree.h b/xen/include/xen/device_tree.h index 5cc1905..3e50383 100644 --- a/xen/include/xen/device_tree.h +++ b/xen/include/xen/device_tree.h @@ -21,11 +21,12 @@ #define NR_MEM_BANKS 8 #define MOD_XEN 0 -#define MOD_KERNEL 1 -#define MOD_INITRD 2 -#define NR_MODULES 3 +#define MOD_FDT 1 +#define MOD_KERNEL 2 +#define MOD_INITRD 3 +#define NR_MODULES 4 -#define MOD_DISCARD_FIRST MOD_KERNEL +#define MOD_DISCARD_FIRST MOD_FDT struct membank { paddr_t start; @@ -166,7 +167,7 @@ typedef int (*device_tree_node_func)(const void *fdt, extern struct dt_early_info early_info; extern void *device_tree_flattened; -size_t __init device_tree_early_init(const void *fdt); +size_t __init device_tree_early_init(const void *fdt, paddr_t paddr); void __init device_tree_get_reg(const u32 **cell, u32 address_cells, u32 size_cells, -- 1.7.10.4 _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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