Re: Regarding virtual to physical memory mapping..
On Thu, Dec 31, 2009 at 01:31:05PM +0100, Vladimir 'φ-coder/phcoder' Serbinenko wrote: I wanted to know whether I can allocate some memory in the region below 1MB? Only in experimental branch. But we're not currently sure if we will use this. We can use this. My concerns are with making intrusive changes in the standard heap. I think it's important that kern/mm.c is small and simple, but this doesn't preclude doing more fancy stuff in non-core areas. Sorry if I was unclear about it. -- Robert Millan Be the change you want to see in the world -- Gandhi ___ Grub-devel mailing list Grub-devel@gnu.org http://lists.gnu.org/mailman/listinfo/grub-devel
Regarding virtual to physical memory mapping..
Hi all, I am working on grub-1.97.1. I wanted to know if there is any mechanism in grub2 that maps virtual addresses to physical addresses below 1 MB? When I checked the code for grub-0.97, I found that there are function as below #define phys_to_virt(x) (x) #define virt_to_phys(x) (x) Are there any similar functions in grub-1.97.1? Also, when I allocated memory using grub_malloc() and printed the address returned from the function it was (0x7da6d810). This seems to be a 32-bit address. I wanted to know whether I can allocate some memory in the region below 1MB? Regards, Kiran Pawar. ___ Grub-devel mailing list Grub-devel@gnu.org http://lists.gnu.org/mailman/listinfo/grub-devel
Re: Regarding virtual to physical memory mapping..
kiran pawar wrote: Hi all, I am working on grub-1.97.1. I wanted to know if there is any mechanism in grub2 that maps virtual addresses to physical addresses below 1 MB? When I checked the code for grub-0.97, I found that there are function as below #define phys_to_virt(x) (x) #define virt_to_phys(x) (x) grub runs without paging enabled. So such function is identity on x86. Are there any similar functions in grub-1.97.1? Also, when I allocated memory using grub_malloc() and printed the address returned from the function it was (0x7da6d810). This seems to be a 32-bit address. I wanted to know whether I can allocate some memory in the region below 1MB? Only in experimental branch. But we're not currently sure if we will use this. If you want to make a BIOS call then use memory at GRUB_SCRATCH_ADDR. If you do something else please explain Regards, Kiran Pawar. ___ Grub-devel mailing list Grub-devel@gnu.org http://lists.gnu.org/mailman/listinfo/grub-devel -- Regards Vladimir 'φ-coder/phcoder' Serbinenko signature.asc Description: OpenPGP digital signature ___ Grub-devel mailing list Grub-devel@gnu.org http://lists.gnu.org/mailman/listinfo/grub-devel
Re: Regarding virtual to physical memory mapping..
El jue, 31-12-2009 a las 13:31 +0100, Vladimir 'φ-coder/phcoder' Serbinenko escribió: kiran pawar wrote: Also, when I allocated memory using grub_malloc() and printed the address returned from the function it was (0x7da6d810). This seems to be a 32-bit address. I wanted to know whether I can allocate some memory in the region below 1MB? Only in experimental branch. But we're not currently sure if we will use this. If you want to make a BIOS call then use memory at GRUB_SCRATCH_ADDR. If you do something else please explain How come not? Here's how it's done in drivemap, for example handler_base = grub_mmap_malign_and_register (16, total_size, drivemap_mmap, GRUB_MACHINE_MEMORY_RESERVED, GRUB_MMAP_MALLOC_LOW); -- -- Lazy, Oblivious, Recurrent Disaster -- Habbit signature.asc Description: Esta parte del mensaje está firmada digitalmente ___ Grub-devel mailing list Grub-devel@gnu.org http://lists.gnu.org/mailman/listinfo/grub-devel
