From: Ben Gras Date: Thu, 11 Dec 2008 17:33:13 +0000 (+0000) Subject: use VM functions to allocate ramdisk on demand. some unification in code. X-Git-Tag: v3.1.4~176 X-Git-Url: http://zhaoyanbai.com/repos/?a=commitdiff_plain;h=ef812af5a6435e92ed364b4b323cfc5dd1b47a72;p=minix.git use VM functions to allocate ramdisk on demand. some unification in code. --- diff --git a/drivers/memory/memory.c b/drivers/memory/memory.c index 812ab503f..388604317 100644 --- a/drivers/memory/memory.c +++ b/drivers/memory/memory.c @@ -25,9 +25,6 @@ #include "../../kernel/config.h" #include "../../kernel/type.h" -#define MY_DS_NAME_BASE "dev:memory:ramdisk_base" -#define MY_DS_NAME_SIZE "dev:memory:ramdisk_size" - #include #include @@ -38,7 +35,7 @@ #define NR_DEVS 7 /* number of minor devices */ PRIVATE struct device m_geom[NR_DEVS]; /* base and size of each device */ -PRIVATE int m_seg[NR_DEVS]; /* segment index of each device */ +PRIVATE vir_bytes m_vaddrs[NR_DEVS]; PRIVATE int m_device; /* current device */ PRIVATE struct kinfo kinfo; /* kernel information */ @@ -71,14 +68,6 @@ PRIVATE struct driver m_dtab = { NULL }; -#if 0 -/* One page of temporary mapping area - enough to be able to page-align - * one page. - */ -static char pagedata_buf[2*I386_PAGE_SIZE]; -vir_bytes pagedata_aligned; -#endif - /* Buffer for the /dev/zero null byte feed. */ #define ZERO_BUF_SIZE 1024 PRIVATE char dev_zero[ZERO_BUF_SIZE]; @@ -139,14 +128,13 @@ unsigned nr_req; /* length of request vector */ int safe; /* safe copies */ { /* Read or write one the driver's minor devices. */ - phys_bytes mem_phys; - int seg; unsigned count, left, chunk; vir_bytes user_vir, vir_offset = 0; struct device *dv; unsigned long dv_size; int s, r; off_t position; + vir_bytes dev_vaddr; if(!safe) { printf("m_transfer: unsafe?\n"); @@ -161,6 +149,7 @@ int safe; /* safe copies */ /* Get minor device number and check for /dev/null. */ dv = &m_geom[m_device]; dv_size = cv64ul(dv->dv_size); + dev_vaddr = m_vaddrs[m_device]; while (nr_req > 0) { @@ -175,22 +164,22 @@ int safe; /* safe copies */ if (opcode == DEV_GATHER_S) return(OK); /* always at EOF */ break; - /* Virtual copying. For RAM disk, kernel memory and boot device. */ + /* Virtual copying. For RAM disk, kernel memory and internal FS. */ case KMEM_DEV: - return EIO; - break; case RAM_DEV: - case BOOT_DEV: + case IMGRD_DEV: + if(!dev_vaddr || dev_vaddr == (vir_bytes) MAP_FAILED) { + printf("MEM: dev %d not initialized\n", m_device); + return EIO; + } if (position >= dv_size) return(OK); /* check for EOF */ if (position + count > dv_size) count = dv_size - position; - seg = m_seg[m_device]; - - if (opcode == DEV_GATHER_S) { /* copy actual data */ + if (opcode == DEV_GATHER_S) { /* copy actual data */ r=sys_safecopyto(proc_nr, user_vir, vir_offset, - position, count, seg); + dev_vaddr + position, count, D); } else { r=sys_safecopyfrom(proc_nr, user_vir, vir_offset, - position, count, seg); + dev_vaddr + position, count, D); } if(r != OK) { panic("MEM","I/O copy failed",r); @@ -208,12 +197,13 @@ int safe; /* safe copies */ static char *vaddr; int r; u32_t subcount; + phys_bytes mem_phys; if (position >= dv_size) return(OK); /* check for EOF */ if (position + count > dv_size) count = dv_size - position; - mem_phys = cv64ul(dv->dv_base) + position; + mem_phys = position; page_off = mem_phys % I386_PAGE_SIZE; pagestart = mem_phys - page_off; @@ -275,19 +265,6 @@ int safe; /* safe copies */ } break; - case IMGRD_DEV: - if (position >= dv_size) return(OK); /* check for EOF */ - if (position + count > dv_size) count = dv_size - position; - - if (opcode == DEV_GATHER_S) { /* copy actual data */ - s=sys_safecopyto(proc_nr, user_vir, vir_offset, - (vir_bytes)&imgrd[position], count, D); - } else { - s=sys_safecopyfrom(proc_nr, user_vir, vir_offset, - (vir_bytes)&imgrd[position], count, D); - } - break; - /* Unknown (illegal) minor device. */ default: return(EINVAL); @@ -333,64 +310,37 @@ PRIVATE void m_init() { /* Initialize this task. All minor devices are initialized one by one. */ u32_t ramdev_size; - u32_t ramdev_base; int i, s; if (OK != (s=sys_getkinfo(&kinfo))) { panic("MEM","Couldn't get kernel information.",s); } - /* Install remote segment for /dev/kmem memory. */ #if 0 + /* Map in kernel memory for /dev/kmem. */ m_geom[KMEM_DEV].dv_base = cvul64(kinfo.kmem_base); m_geom[KMEM_DEV].dv_size = cvul64(kinfo.kmem_size); - if (OK != (s=sys_segctl(&m_seg[KMEM_DEV], (u16_t *) &s, (vir_bytes *) &s, - kinfo.kmem_base, kinfo.kmem_size))) { - panic("MEM","Couldn't install remote segment.",s); + if((m_vaddrs[KMEM_DEV] = vm_map_phys(SELF, (void *) kinfo.kmem_base, + kinfo.kmem_size)) == MAP_FAILED) { + printf("MEM: Couldn't map in /dev/kmem."); } #endif - /* Install remote segment for /dev/boot memory, if enabled. */ - m_geom[BOOT_DEV].dv_base = cvul64(kinfo.bootdev_base); - m_geom[BOOT_DEV].dv_size = cvul64(kinfo.bootdev_size); - if (kinfo.bootdev_base > 0) { - if (OK != (s=sys_segctl(&m_seg[BOOT_DEV], (u16_t *) &s, (vir_bytes *) &s, - kinfo.bootdev_base, kinfo.bootdev_size))) { - panic("MEM","Couldn't install remote segment.",s); - } - } - - /* See if there are already RAM disk details at the Data Store server. */ - if(ds_retrieve_u32(MY_DS_NAME_BASE, &ramdev_base) == OK && - ds_retrieve_u32(MY_DS_NAME_SIZE, &ramdev_size) == OK) { - printf("MEM retrieved size %u and base %u from DS, status %d\n", - ramdev_size, ramdev_base, s); - if (OK != (s=sys_segctl(&m_seg[RAM_DEV], (u16_t *) &s, - (vir_bytes *) &s, ramdev_base, ramdev_size))) { - panic("MEM","Couldn't install remote segment.",s); - } - m_geom[RAM_DEV].dv_base = cvul64(ramdev_base); - m_geom[RAM_DEV].dv_size = cvul64(ramdev_size); - printf("MEM stored retrieved details as new RAM disk\n"); - } - /* Ramdisk image built into the memory driver */ m_geom[IMGRD_DEV].dv_base= cvul64(0); m_geom[IMGRD_DEV].dv_size= cvul64(imgrd_size); + m_vaddrs[IMGRD_DEV] = (vir_bytes) imgrd; /* Initialize /dev/zero. Simply write zeros into the buffer. */ for (i=0; idv_base = cvul64(ramdev_base); dv->dv_size = cvul64(ramdev_size); first_time= 0; break;